added UnivariateRealFunction type implementations of the java.lang.Math methods

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/math/trunk@889007 13f79535-47bb-0310-9956-ffa450edef68

pom.xml

@@ -166,6 +166,9 @@
       <name>Benjamin McCann</name>
       <url>http://www.benmccann.com</url>
     </contributor>
+    <contributor>
+      <name>Jake Mannix</name>
+    </contributor>
     <contributor>
       <name>Fredrik Norin</name>
     </contributor>

src/main/java/org/apache/commons/math/analysis/UnivariateRealFunctions.java

@@ -0,0 +1,225 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.commons.math.analysis;
+
+
+/**
+ * Set of {@link UnivariateRealFunction} classes wrapping methods from
+ * the standard Math class.
+ *
+ * @version $Revision$ $Date$
+ */
+public class UnivariateRealFunctions {
+
+    /** The {@code Math.abs} method wrapped as a {@link UnivariateRealFunction}. */
+    public static final UnivariateRealFunction ABS = new UnivariateRealFunction() {
+        /** {@inheritDoc} */
+        public double value(double d) {
+            return Math.abs(d);
+        }
+    };
+
+    /** The - operator wrapped as a {@link UnivariateRealFunction}. */
+    public static final UnivariateRealFunction NEGATE = new UnivariateRealFunction() {
+        /** {@inheritDoc} */
+        public double value(double d) {
+            return -d;
+        }
+    };
+
+    /** The {@code Math.sin} method wrapped as a {@link UnivariateRealFunction}. */
+    public static final UnivariateRealFunction SIN = new UnivariateRealFunction() {
+        /** {@inheritDoc} */
+        public double value(double d) {
+            return Math.sin(d);
+        }
+    };
+
+    /** The {@code Math.sqrt} method wrapped as a {@link UnivariateRealFunction}. */
+    public static final UnivariateRealFunction SQRT = new UnivariateRealFunction() {
+        /** {@inheritDoc} */
+        public double value(double d) {
+            return Math.sqrt(d);
+        }
+    };
+
+    /** The {@code Math.sinh} method wrapped as a {@link UnivariateRealFunction}. */
+    public static final UnivariateRealFunction SINH = new UnivariateRealFunction() {
+        /** {@inheritDoc} */
+        public double value(double d) {
+            return Math.sinh(d);
+        }
+    };
+
+    /** The {@code Math.exp} method wrapped as a {@link UnivariateRealFunction}. */
+    public static final UnivariateRealFunction EXP = new UnivariateRealFunction() {
+        /** {@inheritDoc} */
+        public double value(double d) {
+            return Math.exp(d);
+        }
+    };
+
+    /** The {@code Math.expm1} method wrapped as a {@link UnivariateRealFunction}. */
+    public static final UnivariateRealFunction EXP1M = new UnivariateRealFunction() {
+        /** {@inheritDoc} */
+        public double value(double d) {
+            return Math.expm1(d);
+        }
+    };
+
+    /** The {@code Math.asin} method wrapped as a {@link UnivariateRealFunction}. */
+    public static final UnivariateRealFunction ASIN = new UnivariateRealFunction() {
+        /** {@inheritDoc} */
+        public double value(double d) {
+            return Math.asin(d);
+        }
+    };
+
+    /** The {@code Math.atan} method wrapped as a {@link UnivariateRealFunction}. */
+    public static final UnivariateRealFunction ATAN = new UnivariateRealFunction() {
+        /** {@inheritDoc} */
+        public double value(double d) {
+            return Math.atan(d);
+        }
+    };
+
+    /** The {@code Math.tan} method wrapped as a {@link UnivariateRealFunction}. */
+    public static final UnivariateRealFunction TAN = new UnivariateRealFunction() {
+        /** {@inheritDoc} */
+        public double value(double d) {
+            return Math.tan(d);
+        }
+    };
+
+    /** The {@code Math.tanh} method wrapped as a {@link UnivariateRealFunction}. */
+    public static final UnivariateRealFunction TANH = new UnivariateRealFunction() {
+        /** {@inheritDoc} */
+        public double value(double d) {
+            return Math.tanh(d);
+        }
+    };
+
+    /** The {@code Math.cbrt} method wrapped as a {@link UnivariateRealFunction}. */
+    public static final UnivariateRealFunction CBRT = new UnivariateRealFunction() {
+        /** {@inheritDoc} */
+        public double value(double d) {
+            return Math.cbrt(d);
+        }
+    };
+
+    /** The {@code Math.ceil} method wrapped as a {@link UnivariateRealFunction}. */
+    public static final UnivariateRealFunction CEIL = new UnivariateRealFunction() {
+        /** {@inheritDoc} */
+        public double value(double d) {
+            return Math.ceil(d);
+        }
+    };
+
+    /** The {@code Math.floor} method wrapped as a {@link UnivariateRealFunction}. */
+    public static final UnivariateRealFunction FLOOR = new UnivariateRealFunction() {
+        /** {@inheritDoc} */
+        public double value(double d) {
+            return Math.floor(d);
+        }
+    };
+
+    /** The {@code Math.log} method wrapped as a {@link UnivariateRealFunction}. */
+    public static final UnivariateRealFunction LOG = new UnivariateRealFunction() {
+        /** {@inheritDoc} */
+        public double value(double d) {
+            return Math.log(d);
+        }
+    };
+
+    /** The {@code Math.log10} method wrapped as a {@link UnivariateRealFunction}. */
+    public static final UnivariateRealFunction LOG10 = new UnivariateRealFunction() {
+        /** {@inheritDoc} */
+        public double value(double d) {
+            return Math.log10(d);
+        }
+    };
+
+    /** The {@code Math.cos} method wrapped as a {@link UnivariateRealFunction}. */
+    public static final UnivariateRealFunction COS = new UnivariateRealFunction() {
+        /** {@inheritDoc} */
+        public double value(double d) {
+            return Math.cos(d);
+        }
+    };
+
+    /** The {@code Math.abs} method wrapped as a {@link UnivariateRealFunction}. */
+    public static final UnivariateRealFunction ACOS = new UnivariateRealFunction() {
+        /** {@inheritDoc} */
+        public double value(double d) {
+            return Math.acos(d);
+        }
+    };
+
+    /** The {@code Math.cosh} method wrapped as a {@link UnivariateRealFunction}. */
+    public static final UnivariateRealFunction COSH = new UnivariateRealFunction() {
+        /** {@inheritDoc} */
+        public double value(double d) {
+            return Math.cosh(d);
+        }
+    };
+
+    /** The {@code Math.rint} method wrapped as a {@link UnivariateRealFunction}. */
+    public static final UnivariateRealFunction RINT = new UnivariateRealFunction() {
+        /** {@inheritDoc} */
+        public double value(double d) {
+            return Math.rint(d);
+        }
+    };
+
+    /** The {@code Math.signum} method wrapped as a {@link UnivariateRealFunction}. */
+    public static final UnivariateRealFunction SIGNUM = new UnivariateRealFunction() {
+        /** {@inheritDoc} */
+        public double value(double d) {
+            return Math.signum(d);
+        }
+    };
+
+    /** The {@code Math.ulp} method wrapped as a {@link UnivariateRealFunction}. */
+    public static final UnivariateRealFunction ULP = new UnivariateRealFunction() {
+        /** {@inheritDoc} */
+        public double value(double d) {
+            return Math.ulp(d);
+        }
+    };
+
+    /** The {@code Math.pow} method wrapped as a {@link UnivariateRealFunction}. */
+    public static class Pow implements UnivariateRealFunction {
+
+        /** The power to which the value should be raised. */
+        private final double pow;
+
+        /** Simple constructor.
+         * @param pow the power to which the value should be raised
+         */
+        public Pow(double pow) {
+            this.pow = pow;
+        }
+
+        /** {@inheritDoc} */
+        public double value(double d) {
+            return Math.pow(d, pow);
+        }
+
+    }
+
+}