diff --git a/src/experimental/org/apache/commons/math/analysis/DerivativeOperatorFactory.java b/src/experimental/org/apache/commons/math/analysis/DerivativeOperatorFactory.java
new file mode 100644
index 000000000..018058cbb
--- /dev/null
+++ b/src/experimental/org/apache/commons/math/analysis/DerivativeOperatorFactory.java
@@ -0,0 +1,24 @@
+/*
+ * Created on Nov 19, 2003
+ *
+ * To change the template for this generated file go to
+ * Window>Preferences>Java>Code Generation>Code and Comments
+ */
+package org.apache.commons.math.analysis;
+
+public class DerivativeOperatorFactory {
+    
+     public static DerivativeOperatorFactory newInstance() {
+         return null;
+     }
+
+     public FunctionOperator getDefaultDerivativeOperator() {
+         return null;
+     }
+
+     public FunctionOperator getCenteredDifferenceDerivativeOperator(){
+         return null;
+     }
+
+     // and so on for other implementations of numerical deriv's
+}
\ No newline at end of file
diff --git a/src/experimental/org/apache/commons/math/analysis/DerivativeOperatorFactoryTest.java b/src/experimental/org/apache/commons/math/analysis/DerivativeOperatorFactoryTest.java
new file mode 100644
index 000000000..24e6da935
--- /dev/null
+++ b/src/experimental/org/apache/commons/math/analysis/DerivativeOperatorFactoryTest.java
@@ -0,0 +1,36 @@
+/*
+ * Created on Nov 19, 2003
+ *
+ * To change the template for this generated file go to
+ * Window>Preferences>Java>Code Generation>Code and Comments
+ */
+package org.apache.commons.math.analysis;
+
+import junit.framework.TestCase;
+
+/**
+ * @author Administrator
+ *
+ * To change the template for this generated type comment go to
+ * Window>Preferences>Java>Code Generation>Code and Comments
+ */
+public class DerivativeOperatorFactoryTest extends TestCase {
+
+    /**
+     * Constructor for DerivativeOperatorFactoryTest.
+     * @param arg0
+     */
+    public DerivativeOperatorFactoryTest(String arg0) {
+        super(arg0);
+    }
+    
+    //UnivariateRealFunction f = new SomeUserDefinedFunction();
+    //FunctionOperator derivative =  
+    //  DerivativeOperatorFactory.newInstance().getDefaultDerivativeOperator();
+
+    //UnivariateRealFunction g = derivative.evaluate( f );
+
+    // to obtain the value of f'(0.0) use
+    //double fprime_at_0 = g.value( 0.0 );
+
+}
diff --git a/src/experimental/org/apache/commons/math/analysis/FunctionOperator.java b/src/experimental/org/apache/commons/math/analysis/FunctionOperator.java
new file mode 100644
index 000000000..6907a8e86
--- /dev/null
+++ b/src/experimental/org/apache/commons/math/analysis/FunctionOperator.java
@@ -0,0 +1,23 @@
+/*
+ * Created on Nov 19, 2003
+ *
+ * To change the template for this generated file go to
+ * Window>Preferences>Java>Code Generation>Code and Comments
+ */
+package org.apache.commons.math.analysis;
+
+import org.apache.commons.math.MathException;
+
+public interface FunctionOperator {
+
+
+    /**
+     * Evaluate the Function Operator for a given real single variable function.
+     *
+     * @param f the function which should be evaluated
+     * @return the resultant function
+     * @throws MathException if the function couldn't be evaluated
+     */
+    public UnivariateRealFunction evaluate(UnivariateRealFunction f) throws MathException;
+
+}
\ No newline at end of file
diff --git a/src/experimental/org/apache/commons/math/function/Compilable.java b/src/experimental/org/apache/commons/math/function/Compilable.java
new file mode 100644
index 000000000..e3771d971
--- /dev/null
+++ b/src/experimental/org/apache/commons/math/function/Compilable.java
@@ -0,0 +1,67 @@
+/* ====================================================================
+ * The Apache Software License, Version 1.1
+ *
+ * Copyright (c) 2003 The Apache Software Foundation.  All rights
+ * reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * 3. The end-user documentation included with the redistribution, if
+ *    any, must include the following acknowledgement:
+ *       "This product includes software developed by the
+ *        Apache Software Foundation (http://www.apache.org/)."
+ *    Alternately, this acknowledgement may appear in the software itself,
+ *    if and wherever such third-party acknowledgements normally appear.
+ *
+ * 4. The names "The Jakarta Project", "Commons", and "Apache Software
+ *    Foundation" must not be used to endorse or promote products derived
+ *    from this software without prior written permission. For written
+ *    permission, please contact apache@apache.org.
+ *
+ * 5. Products derived from this software may not be called "Apache"
+ *    nor may "Apache" appear in their name without prior written
+ *    permission of the Apache Software Foundation.
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
+ * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
+ * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ * ====================================================================
+ *
+ * This software consists of voluntary contributions made by many
+ * individuals on behalf of the Apache Software Foundation.  For more
+ * information on the Apache Software Foundation, please see
+ * <http://www.apache.org/>.
+ */
+package org.apache.commons.math.function;
+
+/**
+ * @author Administrator
+ *
+ * To change the template for this generated type comment go to
+ * Window>Preferences>Java>Code Generation>Code and Comments
+ */
+public interface Compilable {
+    
+    public abstract Evaluation compile(EvaluationContext context)
+        throws EvaluationException;
+               
+}
\ No newline at end of file
diff --git a/src/experimental/org/apache/commons/math/function/DefaultContext.java b/src/experimental/org/apache/commons/math/function/DefaultContext.java
new file mode 100644
index 000000000..94a57f01b
--- /dev/null
+++ b/src/experimental/org/apache/commons/math/function/DefaultContext.java
@@ -0,0 +1,257 @@
+/* ====================================================================
+ * The Apache Software License, Version 1.1
+ *
+ * Copyright (c) 2003 The Apache Software Foundation.  All rights
+ * reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * 3. The end-user documentation included with the redistribution, if
+ *    any, must include the following acknowledgement:
+ *       "This product includes software developed by the
+ *        Apache Software Foundation (http://www.apache.org/)."
+ *    Alternately, this acknowledgement may appear in the software itself,
+ *    if and wherever such third-party acknowledgements normally appear.
+ *
+ * 4. The names "The Jakarta Project", "Commons", and "Apache Software
+ *    Foundation" must not be used to endorse or promote products derived
+ *    from this software without prior written permission. For written
+ *    permission, please contact apache@apache.org.
+ *
+ * 5. Products derived from this software may not be called "Apache"
+ *    nor may "Apache" appear in their name without prior written
+ *    permission of the Apache Software Foundation.
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
+ * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
+ * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ * ====================================================================
+ *
+ * This software consists of voluntary contributions made by many
+ * individuals on behalf of the Apache Software Foundation.  For more
+ * information on the Apache Software Foundation, please see
+ * <http://www.apache.org/>.
+ */
+package org.apache.commons.math.function;
+
+/**
+ * @author Administrator
+ *
+ * To change the template for this generated type comment go to
+ * Window>Preferences>Java>Code Generation>Code and Comments
+ */
+public class DefaultContext implements EvaluationContext {
+
+    /**
+     * 
+     */
+    public DefaultContext() {
+        super();
+        // TODO Auto-generated constructor stub
+    }
+
+    /* (non-Javadoc)
+     * @see org.apache.archimedes.EvaluationContext#doubleValue(org.apache.archimedes.Evaluation)
+     */
+    public double doubleValue(Evaluation argument) throws EvaluationException {
+        // TODO Auto-generated method stub
+        return ((DefaultValue)argument.evaluate(this)).doubleValue();
+    }
+
+    /* (non-Javadoc)
+     * @see org.apache.archimedes.EvaluationContext#floatValue(org.apache.archimedes.Evaluation)
+     */
+    public float floatValue(Evaluation argument) throws EvaluationException {
+        // TODO Auto-generated method stub
+        return ((DefaultValue)argument.evaluate(this)).floatValue();
+    }
+
+    /* (non-Javadoc)
+     * @see org.apache.archimedes.EvaluationContext#intValue(org.apache.archimedes.Evaluation)
+     */
+    public int intValue(Evaluation argument) throws EvaluationException {
+        // TODO Auto-generated method stub
+        return ((DefaultValue)argument.evaluate(this)).intValue();
+    }
+
+    /* (non-Javadoc)
+     * @see org.apache.archimedes.EvaluationContext#longValue(org.apache.archimedes.Evaluation)
+     */
+    public long longValue(Evaluation argument) throws EvaluationException {
+        // TODO Auto-generated method stub
+        return ((DefaultValue)argument.evaluate(this)).longValue();
+    }
+
+    /* (non-Javadoc)
+     * @see org.apache.archimedes.EvaluationContext#shortValue(org.apache.archimedes.Evaluation)
+     */
+    public short shortValue(Evaluation argument) throws EvaluationException {
+        // TODO Auto-generated method stub
+        return ((DefaultValue)argument.evaluate(this)).shortValue();
+    }
+
+    /* (non-Javadoc)
+     * @see org.apache.archimedes.EvaluationContext#byteValue(org.apache.archimedes.Evaluation)
+     */
+    public byte byteValue(Evaluation argument) throws EvaluationException {
+        // TODO Auto-generated method stub
+        return ((DefaultValue)argument.evaluate(this)).byteValue();
+    }
+
+    /* (non-Javadoc)
+     * @see org.apache.archimedes.EvaluationContext#evaluate(double)
+     */
+    public Evaluation evaluate(double d) {
+        // TODO Auto-generated method stub
+        return new DefaultValue(d);
+    }
+
+    /* (non-Javadoc)
+     * @see org.apache.archimedes.EvaluationContext#evaluate(float)
+     */
+    public Evaluation evaluate(float f) {
+        // TODO Auto-generated method stub
+        return new DefaultValue(f);
+    }
+
+    /* (non-Javadoc)
+     * @see org.apache.archimedes.EvaluationContext#evaluate(int)
+     */
+    public Evaluation evaluate(int i) {
+        // TODO Auto-generated method stub
+        return new DefaultValue(i);
+    }
+
+    /* (non-Javadoc)
+     * @see org.apache.archimedes.EvaluationContext#evaluate(long)
+     */
+    public Evaluation evaluate(long l) {
+        // TODO Auto-generated method stub
+        return new DefaultValue(l);
+    }
+
+    /* (non-Javadoc)
+     * @see org.apache.archimedes.EvaluationContext#evaluate(short)
+     */
+    public Evaluation evaluate(short s) {
+        // TODO Auto-generated method stub
+        return new DefaultValue(s);
+    }
+
+    /* (non-Javadoc)
+     * @see org.apache.archimedes.EvaluationContext#evaluate(byte)
+     */
+    public Evaluation evaluate(byte b) {
+        // TODO Auto-generated method stub
+        return new DefaultValue(b);
+    }
+
+    public class DefaultValue extends Number implements Evaluation {
+
+        Number value;
+
+        /**
+         * 
+         */
+        DefaultValue() {
+            super();
+            // TODO Auto-generated constructor stub
+        }
+
+        DefaultValue(Number n) {
+            value = n;
+        }
+                
+        DefaultValue(double d) {
+            value = new Double(d);
+        }
+
+        DefaultValue(float f) {
+            value = new Float(f);
+        }
+
+        DefaultValue(int i) {
+            value = new Integer(i);
+        }
+
+        DefaultValue(long l) {
+            value = new Long(l);
+        }
+        
+        /* (non-Javadoc)
+         * @see org.apache.archimedes.Evaluation#evaluate(org.apache.archimedes.EvaluationContext)
+         */
+        public Evaluation evaluate(EvaluationContext context)
+            throws EvaluationException {
+            return this;
+        }
+
+        /* (non-Javadoc)
+         * @see java.lang.Number#intValue()
+         */
+        public int intValue() {
+            // TODO Auto-generated method stub
+            return value.intValue();
+        }
+
+        /* (non-Javadoc)
+         * @see java.lang.Number#longValue()
+         */
+        public long longValue() {
+            // TODO Auto-generated method stub
+            return value.longValue();
+        }
+
+        /* (non-Javadoc)
+         * @see java.lang.Number#floatValue()
+         */
+        public float floatValue() {
+            // TODO Auto-generated method stub
+            return value.floatValue();
+        }
+
+        /* (non-Javadoc)
+         * @see java.lang.Number#doubleValue()
+         */
+        public double doubleValue() {
+            // TODO Auto-generated method stub
+            return value.doubleValue();
+        }
+
+        /* (non-Javadoc)
+         * @see java.lang.Number#byteValue()
+         */
+        public byte byteValue() {
+            // TODO Auto-generated method stub
+            return value.byteValue();
+        }
+
+        /* (non-Javadoc)
+         * @see java.lang.Number#shortValue()
+         */
+        public short shortValue() {
+            // TODO Auto-generated method stub
+            return value.shortValue();
+        }
+
+    }
+}
diff --git a/src/experimental/org/apache/commons/math/function/Evaluation.java b/src/experimental/org/apache/commons/math/function/Evaluation.java
new file mode 100644
index 000000000..add0ba8fd
--- /dev/null
+++ b/src/experimental/org/apache/commons/math/function/Evaluation.java
@@ -0,0 +1,67 @@
+/* ====================================================================
+ * The Apache Software License, Version 1.1
+ *
+ * Copyright (c) 2003 The Apache Software Foundation.  All rights
+ * reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * 3. The end-user documentation included with the redistribution, if
+ *    any, must include the following acknowledgement:
+ *       "This product includes software developed by the
+ *        Apache Software Foundation (http://www.apache.org/)."
+ *    Alternately, this acknowledgement may appear in the software itself,
+ *    if and wherever such third-party acknowledgements normally appear.
+ *
+ * 4. The names "The Jakarta Project", "Commons", and "Apache Software
+ *    Foundation" must not be used to endorse or promote products derived
+ *    from this software without prior written permission. For written
+ *    permission, please contact apache@apache.org.
+ *
+ * 5. Products derived from this software may not be called "Apache"
+ *    nor may "Apache" appear in their name without prior written
+ *    permission of the Apache Software Foundation.
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
+ * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
+ * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ * ====================================================================
+ *
+ * This software consists of voluntary contributions made by many
+ * individuals on behalf of the Apache Software Foundation.  For more
+ * information on the Apache Software Foundation, please see
+ * <http://www.apache.org/>.
+ */
+package org.apache.commons.math.function;
+
+/**
+ * @author Administrator
+ *
+ * To change the template for this generated type comment go to
+ * Window>Preferences>Java>Code Generation>Code and Comments
+ */
+public interface Evaluation {
+    
+    public abstract Evaluation evaluate(EvaluationContext context)
+        throws EvaluationException;
+       
+}
\ No newline at end of file
diff --git a/src/experimental/org/apache/commons/math/function/EvaluationContext.java b/src/experimental/org/apache/commons/math/function/EvaluationContext.java
new file mode 100644
index 000000000..d4a51dc92
--- /dev/null
+++ b/src/experimental/org/apache/commons/math/function/EvaluationContext.java
@@ -0,0 +1,88 @@
+/* ====================================================================
+ * The Apache Software License, Version 1.1
+ *
+ * Copyright (c) 2003 The Apache Software Foundation.  All rights
+ * reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * 3. The end-user documentation included with the redistribution, if
+ *    any, must include the following acknowledgement:
+ *       "This product includes software developed by the
+ *        Apache Software Foundation (http://www.apache.org/)."
+ *    Alternately, this acknowledgement may appear in the software itself,
+ *    if and wherever such third-party acknowledgements normally appear.
+ *
+ * 4. The names "The Jakarta Project", "Commons", and "Apache Software
+ *    Foundation" must not be used to endorse or promote products derived
+ *    from this software without prior written permission. For written
+ *    permission, please contact apache@apache.org.
+ *
+ * 5. Products derived from this software may not be called "Apache"
+ *    nor may "Apache" appear in their name without prior written
+ *    permission of the Apache Software Foundation.
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
+ * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
+ * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ * ====================================================================
+ *
+ * This software consists of voluntary contributions made by many
+ * individuals on behalf of the Apache Software Foundation.  For more
+ * information on the Apache Software Foundation, please see
+ * <http://www.apache.org/>.
+ */
+package org.apache.commons.math.function;
+
+/**
+ * @author Administrator
+ *
+ * To change the template for this generated type comment go to
+ * Window>Preferences>Java>Code Generation>Code and Comments
+ */
+public interface EvaluationContext {
+    
+    public abstract double doubleValue(Evaluation argument) throws EvaluationException ;
+    
+    public abstract float floatValue(Evaluation argument) throws EvaluationException ;
+    
+    public abstract int intValue(Evaluation argument) throws EvaluationException ;
+    
+    public abstract long longValue(Evaluation argument) throws EvaluationException ;
+    
+    public abstract short shortValue(Evaluation argument) throws EvaluationException ;
+    
+    public abstract byte byteValue(Evaluation argument) throws EvaluationException ;
+    
+    public abstract Evaluation evaluate(double d);
+    
+    public abstract Evaluation evaluate(float f);
+    
+    public abstract Evaluation evaluate(int i);
+    
+    public abstract Evaluation evaluate(long l);
+    
+    public abstract Evaluation evaluate(short s);
+    
+    public abstract Evaluation evaluate(byte b);
+
+}
\ No newline at end of file
diff --git a/src/experimental/org/apache/commons/math/function/EvaluationException.java b/src/experimental/org/apache/commons/math/function/EvaluationException.java
new file mode 100644
index 000000000..2f89859e0
--- /dev/null
+++ b/src/experimental/org/apache/commons/math/function/EvaluationException.java
@@ -0,0 +1,97 @@
+/* ====================================================================
+ * The Apache Software License, Version 1.1
+ *
+ * Copyright (c) 2003 The Apache Software Foundation.  All rights
+ * reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * 3. The end-user documentation included with the redistribution, if
+ *    any, must include the following acknowledgement:
+ *       "This product includes software developed by the
+ *        Apache Software Foundation (http://www.apache.org/)."
+ *    Alternately, this acknowledgement may appear in the software itself,
+ *    if and wherever such third-party acknowledgements normally appear.
+ *
+ * 4. The names "The Jakarta Project", "Commons", and "Apache Software
+ *    Foundation" must not be used to endorse or promote products derived
+ *    from this software without prior written permission. For written
+ *    permission, please contact apache@apache.org.
+ *
+ * 5. Products derived from this software may not be called "Apache"
+ *    nor may "Apache" appear in their name without prior written
+ *    permission of the Apache Software Foundation.
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
+ * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
+ * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ * ====================================================================
+ *
+ * This software consists of voluntary contributions made by many
+ * individuals on behalf of the Apache Software Foundation.  For more
+ * information on the Apache Software Foundation, please see
+ * <http://www.apache.org/>.
+ */
+package org.apache.commons.math.function;
+
+/**
+ * @author Administrator
+ *
+ * To change the template for this generated type comment go to
+ * Window>Preferences>Java>Code Generation>Code and Comments
+ */
+public class EvaluationException extends Exception {
+
+    /**
+     * 
+     */
+    public EvaluationException() {
+        super();
+        // TODO Auto-generated constructor stub
+    }
+
+    /**
+     * @param message
+     */
+    public EvaluationException(String message) {
+        super(message);
+        // TODO Auto-generated constructor stub
+    }
+
+    /**
+     * @param message
+     * @param cause
+     */
+    public EvaluationException(String message, Throwable cause) {
+        super(message, cause);
+        // TODO Auto-generated constructor stub
+    }
+
+    /**
+     * @param cause
+     */
+    public EvaluationException(Throwable cause) {
+        super(cause);
+        // TODO Auto-generated constructor stub
+    }
+
+}
diff --git a/src/experimental/org/apache/commons/math/function/Variable.java b/src/experimental/org/apache/commons/math/function/Variable.java
new file mode 100644
index 000000000..56afbd60a
--- /dev/null
+++ b/src/experimental/org/apache/commons/math/function/Variable.java
@@ -0,0 +1,76 @@
+/* ====================================================================
+ * The Apache Software License, Version 1.1
+ *
+ * Copyright (c) 2003 The Apache Software Foundation.  All rights
+ * reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * 3. The end-user documentation included with the redistribution, if
+ *    any, must include the following acknowledgement:
+ *       "This product includes software developed by the
+ *        Apache Software Foundation (http://www.apache.org/)."
+ *    Alternately, this acknowledgement may appear in the software itself,
+ *    if and wherever such third-party acknowledgements normally appear.
+ *
+ * 4. The names "The Jakarta Project", "Commons", and "Apache Software
+ *    Foundation" must not be used to endorse or promote products derived
+ *    from this software without prior written permission. For written
+ *    permission, please contact apache@apache.org.
+ *
+ * 5. Products derived from this software may not be called "Apache"
+ *    nor may "Apache" appear in their name without prior written
+ *    permission of the Apache Software Foundation.
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
+ * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
+ * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ * ====================================================================
+ *
+ * This software consists of voluntary contributions made by many
+ * individuals on behalf of the Apache Software Foundation.  For more
+ * information on the Apache Software Foundation, please see
+ * <http://www.apache.org/>.
+ */
+package org.apache.commons.math.function;
+
+import java.io.Serializable;
+
+/**
+ * @author Administrator
+ *
+ * To change the template for this generated type comment go to
+ * Window - Preferences - Java - Code Generation - Code and Comments
+ */
+public class Variable implements Evaluation, Serializable {
+
+    public Evaluation evaluate(EvaluationContext context)
+        throws EvaluationException {
+		return null;
+        
+        //context.evaluate(value.doubleValue());
+	}
+    
+    public String toString() {
+    	return "Variable";
+	}	
+}
\ No newline at end of file
diff --git a/src/experimental/org/apache/commons/math/function/simple/Add.java b/src/experimental/org/apache/commons/math/function/simple/Add.java
new file mode 100644
index 000000000..b1fdfe637
--- /dev/null
+++ b/src/experimental/org/apache/commons/math/function/simple/Add.java
@@ -0,0 +1,94 @@
+/* ====================================================================
+ * The Apache Software License, Version 1.1
+ *
+ * Copyright (c) 2003 The Apache Software Foundation.  All rights
+ * reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * 3. The end-user documentation included with the redistribution, if
+ *    any, must include the following acknowledgement:
+ *       "This product includes software developed by the
+ *        Apache Software Foundation (http://www.apache.org/)."
+ *    Alternately, this acknowledgement may appear in the software itself,
+ *    if and wherever such third-party acknowledgements normally appear.
+ *
+ * 4. The names "The Jakarta Project", "Commons", and "Apache Software
+ *    Foundation" must not be used to endorse or promote products derived
+ *    from this software without prior written permission. For written
+ *    permission, please contact apache@apache.org.
+ *
+ * 5. Products derived from this software may not be called "Apache"
+ *    nor may "Apache" appear in their name without prior written
+ *    permission of the Apache Software Foundation.
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
+ * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
+ * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ * ====================================================================
+ *
+ * This software consists of voluntary contributions made by many
+ * individuals on behalf of the Apache Software Foundation.  For more
+ * information on the Apache Software Foundation, please see
+ * <http://www.apache.org/>.
+ */
+package org.apache.commons.math.function.simple;
+
+import java.io.Serializable;
+
+import org.apache.commons.math.function.Compilable;
+import org.apache.commons.math.function.Evaluation;
+import org.apache.commons.math.function.EvaluationContext;
+import org.apache.commons.math.function.EvaluationException;
+
+/**
+ * @author Administrator
+ *
+ * To change the template for this generated type comment go to
+ * Window - Preferences - Java - Code Generation - Code and Comments
+ */
+public class Add implements Evaluation, Serializable {
+
+	private Evaluation left;
+
+	private Evaluation right;
+
+	public void setLeftOperand(Evaluation left) {
+		this.left = left;
+	}
+
+	public void setRightOperand(Evaluation right) {
+		this.right = right;
+	}
+
+    public Evaluation evaluate(EvaluationContext context) throws EvaluationException {
+        return context.evaluate(
+            context.doubleValue(left) + context.doubleValue(right)
+        );
+    }
+    
+    
+    public String toString() {
+        return "Add";
+    }
+    
+}
\ No newline at end of file
diff --git a/src/experimental/org/apache/commons/math/function/simple/Divide.java b/src/experimental/org/apache/commons/math/function/simple/Divide.java
new file mode 100644
index 000000000..3cb9e6888
--- /dev/null
+++ b/src/experimental/org/apache/commons/math/function/simple/Divide.java
@@ -0,0 +1,93 @@
+/* ====================================================================
+ * The Apache Software License, Version 1.1
+ *
+ * Copyright (c) 2003 The Apache Software Foundation.  All rights
+ * reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * 3. The end-user documentation included with the redistribution, if
+ *    any, must include the following acknowledgement:
+ *       "This product includes software developed by the
+ *        Apache Software Foundation (http://www.apache.org/)."
+ *    Alternately, this acknowledgement may appear in the software itself,
+ *    if and wherever such third-party acknowledgements normally appear.
+ *
+ * 4. The names "The Jakarta Project", "Commons", and "Apache Software
+ *    Foundation" must not be used to endorse or promote products derived
+ *    from this software without prior written permission. For written
+ *    permission, please contact apache@apache.org.
+ *
+ * 5. Products derived from this software may not be called "Apache"
+ *    nor may "Apache" appear in their name without prior written
+ *    permission of the Apache Software Foundation.
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
+ * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
+ * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ * ====================================================================
+ *
+ * This software consists of voluntary contributions made by many
+ * individuals on behalf of the Apache Software Foundation.  For more
+ * information on the Apache Software Foundation, please see
+ * <http://www.apache.org/>.
+ */
+package org.apache.commons.math.function.simple;
+
+import java.io.Serializable;
+
+import org.apache.commons.math.function.EvaluationContext;
+import org.apache.commons.math.function.Evaluation;
+import org.apache.commons.math.function.EvaluationException;
+
+/**
+ * @author Administrator
+ *
+ * To change the template for this generated type comment go to
+ * Window - Preferences - Java - Code Generation - Code and Comments
+ */
+public class Divide implements Evaluation, Serializable {
+
+    private Evaluation left;
+
+    private Evaluation right;
+
+    public void setLeftOperand(Evaluation left) {
+        this.left = left;
+    }
+
+    public void setRightOperand(Evaluation right) {
+        this.right = right;
+    }
+
+    public Evaluation evaluate(EvaluationContext context) throws EvaluationException {
+        return context.evaluate(
+            context.doubleValue(left) / context.doubleValue(right)
+        );
+    }
+
+    public String toString() {
+        return "Divide";
+    }
+
+    
+}
\ No newline at end of file
diff --git a/src/experimental/org/apache/commons/math/function/simple/Equals.java b/src/experimental/org/apache/commons/math/function/simple/Equals.java
new file mode 100644
index 000000000..db8ca1743
--- /dev/null
+++ b/src/experimental/org/apache/commons/math/function/simple/Equals.java
@@ -0,0 +1,91 @@
+/* ====================================================================
+ * The Apache Software License, Version 1.1
+ *
+ * Copyright (c) 2003 The Apache Software Foundation.  All rights
+ * reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * 3. The end-user documentation included with the redistribution, if
+ *    any, must include the following acknowledgement:
+ *       "This product includes software developed by the
+ *        Apache Software Foundation (http://www.apache.org/)."
+ *    Alternately, this acknowledgement may appear in the software itself,
+ *    if and wherever such third-party acknowledgements normally appear.
+ *
+ * 4. The names "The Jakarta Project", "Commons", and "Apache Software
+ *    Foundation" must not be used to endorse or promote products derived
+ *    from this software without prior written permission. For written
+ *    permission, please contact apache@apache.org.
+ *
+ * 5. Products derived from this software may not be called "Apache"
+ *    nor may "Apache" appear in their name without prior written
+ *    permission of the Apache Software Foundation.
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
+ * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
+ * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ * ====================================================================
+ *
+ * This software consists of voluntary contributions made by many
+ * individuals on behalf of the Apache Software Foundation.  For more
+ * information on the Apache Software Foundation, please see
+ * <http://www.apache.org/>.
+ */
+package org.apache.commons.math.function.simple;
+
+import java.io.Serializable;
+
+import org.apache.commons.math.function.Evaluation;
+import org.apache.commons.math.function.EvaluationContext;
+
+
+/**
+ * @author Administrator
+ *
+ * To change the template for this generated type comment go to
+ * Window - Preferences - Java - Code Generation - Code and Comments
+ */
+public class Equals implements Evaluation, Serializable {
+
+	private Evaluation left;
+
+	private Evaluation right;
+
+	public void setLeftOperand(Evaluation left) {
+		this.left = left;
+	}
+
+	public void setRightOperand(Evaluation right) {
+		this.right = right;
+	}
+    
+	public Evaluation evaluate(EvaluationContext context) {
+
+		return null;
+	}
+    
+    public String toString() {
+        return "Equals";
+    }
+    
+}
\ No newline at end of file
diff --git a/src/experimental/org/apache/commons/math/function/simple/Multiply.java b/src/experimental/org/apache/commons/math/function/simple/Multiply.java
new file mode 100644
index 000000000..40b10ab61
--- /dev/null
+++ b/src/experimental/org/apache/commons/math/function/simple/Multiply.java
@@ -0,0 +1,91 @@
+/* ====================================================================
+ * The Apache Software License, Version 1.1
+ *
+ * Copyright (c) 2003 The Apache Software Foundation.  All rights
+ * reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * 3. The end-user documentation included with the redistribution, if
+ *    any, must include the following acknowledgement:
+ *       "This product includes software developed by the
+ *        Apache Software Foundation (http://www.apache.org/)."
+ *    Alternately, this acknowledgement may appear in the software itself,
+ *    if and wherever such third-party acknowledgements normally appear.
+ *
+ * 4. The names "The Jakarta Project", "Commons", and "Apache Software
+ *    Foundation" must not be used to endorse or promote products derived
+ *    from this software without prior written permission. For written
+ *    permission, please contact apache@apache.org.
+ *
+ * 5. Products derived from this software may not be called "Apache"
+ *    nor may "Apache" appear in their name without prior written
+ *    permission of the Apache Software Foundation.
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
+ * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
+ * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ * ====================================================================
+ *
+ * This software consists of voluntary contributions made by many
+ * individuals on behalf of the Apache Software Foundation.  For more
+ * information on the Apache Software Foundation, please see
+ * <http://www.apache.org/>.
+ */
+package org.apache.commons.math.function.simple;
+
+import java.io.Serializable;
+
+import org.apache.commons.math.function.EvaluationContext;
+import org.apache.commons.math.function.Evaluation;
+import org.apache.commons.math.function.EvaluationException;
+
+/**
+ * @author Administrator
+ *
+ * To change the template for this generated type comment go to
+ * Window - Preferences - Java - Code Generation - Code and Comments
+ */
+public class Multiply implements Evaluation, Serializable {
+
+	private Evaluation left;
+
+	private Evaluation right;
+
+	public void setLeftOperand(Evaluation left) {
+		this.left = left;
+	}
+
+	public void setRightOperand(Evaluation right) {
+		this.right = right;
+	}
+
+    public Evaluation evaluate(EvaluationContext context) throws EvaluationException {
+        return context.evaluate(
+            context.doubleValue(left) * context.doubleValue(right)
+        );
+    }
+    
+    public String toString() {
+        return "Multiply";
+    }
+}
\ No newline at end of file
diff --git a/src/experimental/org/apache/commons/math/function/simple/Power.java b/src/experimental/org/apache/commons/math/function/simple/Power.java
new file mode 100644
index 000000000..b5ef26798
--- /dev/null
+++ b/src/experimental/org/apache/commons/math/function/simple/Power.java
@@ -0,0 +1,95 @@
+/* ====================================================================
+ * The Apache Software License, Version 1.1
+ *
+ * Copyright (c) 2003 The Apache Software Foundation.  All rights
+ * reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * 3. The end-user documentation included with the redistribution, if
+ *    any, must include the following acknowledgement:
+ *       "This product includes software developed by the
+ *        Apache Software Foundation (http://www.apache.org/)."
+ *    Alternately, this acknowledgement may appear in the software itself,
+ *    if and wherever such third-party acknowledgements normally appear.
+ *
+ * 4. The names "The Jakarta Project", "Commons", and "Apache Software
+ *    Foundation" must not be used to endorse or promote products derived
+ *    from this software without prior written permission. For written
+ *    permission, please contact apache@apache.org.
+ *
+ * 5. Products derived from this software may not be called "Apache"
+ *    nor may "Apache" appear in their name without prior written
+ *    permission of the Apache Software Foundation.
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
+ * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
+ * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ * ====================================================================
+ *
+ * This software consists of voluntary contributions made by many
+ * individuals on behalf of the Apache Software Foundation.  For more
+ * information on the Apache Software Foundation, please see
+ * <http://www.apache.org/>.
+ */
+package org.apache.commons.math.function.simple;
+
+import java.io.Serializable;
+
+import org.apache.commons.math.function.Evaluation;
+import org.apache.commons.math.function.EvaluationContext;
+import org.apache.commons.math.function.EvaluationException;
+
+
+/**
+ * @author Administrator
+ *
+ * To change the template for this generated type comment go to
+ * Window - Preferences - Java - Code Generation - Code and Comments
+ */
+public class Power implements Evaluation, Serializable {
+
+	private Evaluation argument;
+
+	private Evaluation power;
+	
+	public void setOperand(Evaluation argument) {
+		this.argument = argument;
+	}
+
+	public void setPower(Evaluation power) {
+		this.power = power;
+	}
+		
+	public Evaluation evaluate(EvaluationContext context) throws EvaluationException {
+        return context.evaluate(
+            Math.pow(
+                context.doubleValue(argument),
+                context.doubleValue(power)
+            )
+        );
+	}
+    
+    public String toString() {
+        return "Power";
+    }
+}
\ No newline at end of file
diff --git a/src/experimental/org/apache/commons/math/function/simple/Sqrt.java b/src/experimental/org/apache/commons/math/function/simple/Sqrt.java
new file mode 100644
index 000000000..25d7df921
--- /dev/null
+++ b/src/experimental/org/apache/commons/math/function/simple/Sqrt.java
@@ -0,0 +1,90 @@
+/* ====================================================================
+ * The Apache Software License, Version 1.1
+ *
+ * Copyright (c) 2003 The Apache Software Foundation.  All rights
+ * reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * 3. The end-user documentation included with the redistribution, if
+ *    any, must include the following acknowledgement:
+ *       "This product includes software developed by the
+ *        Apache Software Foundation (http://www.apache.org/)."
+ *    Alternately, this acknowledgement may appear in the software itself,
+ *    if and wherever such third-party acknowledgements normally appear.
+ *
+ * 4. The names "The Jakarta Project", "Commons", and "Apache Software
+ *    Foundation" must not be used to endorse or promote products derived
+ *    from this software without prior written permission. For written
+ *    permission, please contact apache@apache.org.
+ *
+ * 5. Products derived from this software may not be called "Apache"
+ *    nor may "Apache" appear in their name without prior written
+ *    permission of the Apache Software Foundation.
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
+ * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
+ * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ * ====================================================================
+ *
+ * This software consists of voluntary contributions made by many
+ * individuals on behalf of the Apache Software Foundation.  For more
+ * information on the Apache Software Foundation, please see
+ * <http://www.apache.org/>.
+ */
+package org.apache.commons.math.function.simple;
+
+import java.io.Serializable;
+
+import org.apache.commons.math.function.Evaluation;
+import org.apache.commons.math.function.EvaluationContext;
+import org.apache.commons.math.function.EvaluationException;
+
+
+/**
+ * @author Administrator
+ *
+ * To change the template for this generated type comment go to
+ * Window - Preferences - Java - Code Generation - Code and Comments
+ */
+public class Sqrt implements Evaluation, Serializable {
+
+    private Evaluation argument;
+
+    public void setOperand(Evaluation argument) {
+        this.argument = argument;
+    }
+
+    /* (non-Javadoc)
+     * @see org.apache.archimedes.NumericFunction#evaluate(org.apache.archimedes.EvaluationContext)
+     */
+    public Evaluation evaluate(EvaluationContext context) throws EvaluationException {
+        return context.evaluate(
+            Math.sqrt(context.doubleValue(argument)));
+
+    }
+
+    public String toString() {
+        return "Square Root";
+    }
+
+}
\ No newline at end of file
diff --git a/src/experimental/org/apache/commons/math/function/simple/Subtract.java b/src/experimental/org/apache/commons/math/function/simple/Subtract.java
new file mode 100644
index 000000000..33f7e4a68
--- /dev/null
+++ b/src/experimental/org/apache/commons/math/function/simple/Subtract.java
@@ -0,0 +1,91 @@
+/* ====================================================================
+ * The Apache Software License, Version 1.1
+ *
+ * Copyright (c) 2003 The Apache Software Foundation.  All rights
+ * reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * 3. The end-user documentation included with the redistribution, if
+ *    any, must include the following acknowledgement:
+ *       "This product includes software developed by the
+ *        Apache Software Foundation (http://www.apache.org/)."
+ *    Alternately, this acknowledgement may appear in the software itself,
+ *    if and wherever such third-party acknowledgements normally appear.
+ *
+ * 4. The names "The Jakarta Project", "Commons", and "Apache Software
+ *    Foundation" must not be used to endorse or promote products derived
+ *    from this software without prior written permission. For written
+ *    permission, please contact apache@apache.org.
+ *
+ * 5. Products derived from this software may not be called "Apache"
+ *    nor may "Apache" appear in their name without prior written
+ *    permission of the Apache Software Foundation.
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
+ * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
+ * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ * ====================================================================
+ *
+ * This software consists of voluntary contributions made by many
+ * individuals on behalf of the Apache Software Foundation.  For more
+ * information on the Apache Software Foundation, please see
+ * <http://www.apache.org/>.
+ */
+package org.apache.commons.math.function.simple;
+
+import java.io.Serializable;
+
+import org.apache.commons.math.function.EvaluationContext;
+import org.apache.commons.math.function.Evaluation;
+import org.apache.commons.math.function.EvaluationException;
+
+/**
+ * @author Administrator
+ *
+ * To change the template for this generated type comment go to
+ * Window - Preferences - Java - Code Generation - Code and Comments
+ */
+public class Subtract implements Evaluation, Serializable {
+
+	private Evaluation left;
+
+	private Evaluation right;
+
+	public void setLeftOperand(Evaluation left) {
+		this.left = left;
+	}
+
+	public void setRightOperand(Evaluation right) {
+		this.right = right;
+	}
+
+    public Evaluation evaluate(EvaluationContext context) throws EvaluationException {
+        return context.evaluate(
+            context.doubleValue(left) - context.doubleValue(right)
+        );
+    }
+    
+    public String toString() {
+        return "Subtract";
+    }
+}
\ No newline at end of file
diff --git a/src/experimental/org/apache/commons/math/linear/Decomposer.java b/src/experimental/org/apache/commons/math/linear/Decomposer.java
new file mode 100644
index 000000000..228d28078
--- /dev/null
+++ b/src/experimental/org/apache/commons/math/linear/Decomposer.java
@@ -0,0 +1,19 @@
+/*
+ * Created on Nov 19, 2003
+ *
+ * To change the template for this generated file go to
+ * Window>Preferences>Java>Code Generation>Code and Comments
+ */
+package org.apache.commons.math.linear;
+
+/**
+ * @author Administrator
+ *
+ * To change the template for this generated type comment go to
+ * Window>Preferences>Java>Code Generation>Code and Comments
+ */
+public interface Decomposer {
+
+    Decomposition decompose(RealMatrix);
+    
+}
diff --git a/src/experimental/org/apache/commons/math/linear/Decomposition.java b/src/experimental/org/apache/commons/math/linear/Decomposition.java
new file mode 100644
index 000000000..0867d9339
--- /dev/null
+++ b/src/experimental/org/apache/commons/math/linear/Decomposition.java
@@ -0,0 +1,27 @@
+/*
+ * Created on Nov 19, 2003
+ *
+ * To change the template for this generated file go to
+ * Window>Preferences>Java>Code Generation>Code and Comments
+ */
+package org.apache.commons.math.linear;
+
+/**
+ * @author Administrator
+ *
+ * To change the template for this generated type comment go to
+ * Window>Preferences>Java>Code Generation>Code and Comments
+ */
+public interface Decomposition {
+
+      // solve A*x=b
+      RealVector solve(RealVector b);
+
+
+      // solve matrix equation
+      RealMatrix solve(RealMatrix b);
+
+
+      RealMatrix invert();
+    
+}
diff --git a/src/experimental/org/apache/commons/math/linear/DecompositionFactory.java b/src/experimental/org/apache/commons/math/linear/DecompositionFactory.java
new file mode 100644
index 000000000..c4e32231b
--- /dev/null
+++ b/src/experimental/org/apache/commons/math/linear/DecompositionFactory.java
@@ -0,0 +1,34 @@
+/*
+ * Created on Nov 19, 2003
+ *
+ * To change the template for this generated file go to
+ * Window>Preferences>Java>Code Generation>Code and Comments
+ */
+package org.apache.commons.math.linear;
+
+/**
+ * @author Administrator
+ *
+ * To change the template for this generated type comment go to
+ * Window>Preferences>Java>Code Generation>Code and Comments
+ */
+public abstract  class DecompositionFactory {
+
+    /*
+     * get a matrix specific decomposer factory
+     * class RealMatrix {
+     *     DecompositionFactory getDecompositionFactory();
+     *  }
+     */
+     
+    // get overall default factory
+    public static DecompositionFactory newInstance(){
+        return null;
+    }
+
+    // construct a new default decomposer
+    public abstract Decomposer newDecomposer();
+
+    // example for a specific decomposer (Householder or QR)
+    public abstract Decomposer newQRDecopmposer();
+}
diff --git a/src/experimental/org/apache/commons/math/linear/RealVector.java b/src/experimental/org/apache/commons/math/linear/RealVector.java
new file mode 100644
index 000000000..d30b1ae8d
--- /dev/null
+++ b/src/experimental/org/apache/commons/math/linear/RealVector.java
@@ -0,0 +1,13 @@
+/*
+ * Created on Nov 19, 2003
+ *
+ * To change the template for this generated file go to
+ * Window>Preferences>Java>Code Generation>Code and Comments
+ */
+package org.apache.commons.math.linear;
+
+
+public class RealVector {
+
+
+}