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Added "derivative". 

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/math/trunk@1184933 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Gilles Sadowski 2011-10-16 21:04:19 +00:00
parent f258ecdf91
commit 9092e81cae
21 changed files with 229 additions and 26 deletions
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13
src/main/java/org/apache/commons/math/analysis/function/Acos.java
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@ -18,6 +18,7 @@
package org.apache.commons.math.analysis.function;
import org.apache.commons.math.analysis.UnivariateRealFunction;
import org.apache.commons.math.analysis.DifferentiableUnivariateRealFunction;
import org.apache.commons.math.util.FastMath;
/**
@ -26,9 +27,19 @@ import org.apache.commons.math.util.FastMath;
* @version $Id$
* @since 3.0
*/
public class Acos implements UnivariateRealFunction {
public class Acos implements DifferentiableUnivariateRealFunction {
/** {@inheritDoc} */
public double value(double x) {
return FastMath.acos(x);
}
/** {@inheritDoc} */
public UnivariateRealFunction derivative() {
return new UnivariateRealFunction() {
/** {@inheritDoc} */
public double value(double x) {
return -1 / FastMath.sqrt(1 - x * x);
}
};
}
}

13
src/main/java/org/apache/commons/math/analysis/function/Acosh.java
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@ -18,6 +18,7 @@
package org.apache.commons.math.analysis.function;
import org.apache.commons.math.analysis.UnivariateRealFunction;
import org.apache.commons.math.analysis.DifferentiableUnivariateRealFunction;
import org.apache.commons.math.util.FastMath;
/**
@ -26,9 +27,19 @@ import org.apache.commons.math.util.FastMath;
* @version $Id$
* @since 3.0
*/
public class Acosh implements UnivariateRealFunction {
public class Acosh implements DifferentiableUnivariateRealFunction {
/** {@inheritDoc} */
public double value(double x) {
return FastMath.acosh(x);
}
/** {@inheritDoc} */
public UnivariateRealFunction derivative() {
return new UnivariateRealFunction() {
/** {@inheritDoc} */
public double value(double x) {
return 1 / FastMath.sqrt(x * x - 1);
}
};
}
}

13
src/main/java/org/apache/commons/math/analysis/function/Asin.java
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@ -18,6 +18,7 @@
package org.apache.commons.math.analysis.function;
import org.apache.commons.math.analysis.UnivariateRealFunction;
import org.apache.commons.math.analysis.DifferentiableUnivariateRealFunction;
import org.apache.commons.math.util.FastMath;
/**
@ -26,9 +27,19 @@ import org.apache.commons.math.util.FastMath;
* @version $Id$
* @since 3.0
*/
public class Asin implements UnivariateRealFunction {
public class Asin implements DifferentiableUnivariateRealFunction {
/** {@inheritDoc} */
public double value(double x) {
return FastMath.asin(x);
}
/** {@inheritDoc} */
public UnivariateRealFunction derivative() {
return new UnivariateRealFunction() {
/** {@inheritDoc} */
public double value(double x) {
return 1 / FastMath.sqrt(1 - x * x);
}
};
}
}

13
src/main/java/org/apache/commons/math/analysis/function/Asinh.java
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@ -18,6 +18,7 @@
package org.apache.commons.math.analysis.function;
import org.apache.commons.math.analysis.UnivariateRealFunction;
import org.apache.commons.math.analysis.DifferentiableUnivariateRealFunction;
import org.apache.commons.math.util.FastMath;
/**
@ -26,9 +27,19 @@ import org.apache.commons.math.util.FastMath;
* @version $Id$
* @since 3.0
*/
public class Asinh implements UnivariateRealFunction {
public class Asinh implements DifferentiableUnivariateRealFunction {
/** {@inheritDoc} */
public double value(double x) {
return FastMath.asinh(x);
}
/** {@inheritDoc} */
public UnivariateRealFunction derivative() {
return new UnivariateRealFunction() {
/** {@inheritDoc} */
public double value(double x) {
return 1 / FastMath.sqrt(1 + x * x);
}
};
}
}

13
src/main/java/org/apache/commons/math/analysis/function/Atan.java
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@ -18,6 +18,7 @@
package org.apache.commons.math.analysis.function;
import org.apache.commons.math.analysis.UnivariateRealFunction;
import org.apache.commons.math.analysis.DifferentiableUnivariateRealFunction;
import org.apache.commons.math.util.FastMath;
/**
@ -26,9 +27,19 @@ import org.apache.commons.math.util.FastMath;
* @version $Id$
* @since 3.0
*/
public class Atan implements UnivariateRealFunction {
public class Atan implements DifferentiableUnivariateRealFunction {
/** {@inheritDoc} */
public double value(double x) {
return FastMath.atan(x);
}
/** {@inheritDoc} */
public UnivariateRealFunction derivative() {
return new UnivariateRealFunction() {
/** {@inheritDoc} */
public double value(double x) {
return 1 / (1 + x * x);
}
};
}
}

13
src/main/java/org/apache/commons/math/analysis/function/Atanh.java
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@ -18,6 +18,7 @@
package org.apache.commons.math.analysis.function;
import org.apache.commons.math.analysis.UnivariateRealFunction;
import org.apache.commons.math.analysis.DifferentiableUnivariateRealFunction;
import org.apache.commons.math.util.FastMath;
/**
@ -26,9 +27,19 @@ import org.apache.commons.math.util.FastMath;
* @version $Id$
* @since 3.0
*/
public class Atanh implements UnivariateRealFunction {
public class Atanh implements DifferentiableUnivariateRealFunction {
/** {@inheritDoc} */
public double value(double x) {
return FastMath.atanh(x);
}
/** {@inheritDoc} */
public UnivariateRealFunction derivative() {
return new UnivariateRealFunction() {
/** {@inheritDoc} */
public double value(double x) {
return 1 / (1 - x * x);
}
};
}
}

13
src/main/java/org/apache/commons/math/analysis/function/Cbrt.java
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@ -18,6 +18,7 @@
package org.apache.commons.math.analysis.function;
import org.apache.commons.math.analysis.UnivariateRealFunction;
import org.apache.commons.math.analysis.DifferentiableUnivariateRealFunction;
import org.apache.commons.math.util.FastMath;
/**
@ -26,9 +27,19 @@ import org.apache.commons.math.util.FastMath;
* @version $Id$
* @since 3.0
*/
public class Cbrt implements UnivariateRealFunction {
public class Cbrt implements DifferentiableUnivariateRealFunction {
/** {@inheritDoc} */
public double value(double x) {
return FastMath.cbrt(x);
}
/** {@inheritDoc} */
public UnivariateRealFunction derivative() {
return new UnivariateRealFunction() {
/** {@inheritDoc} */
public double value(double x) {
return 1 / (3 * FastMath.cbrt(x * x));
}
};
}
}

9
src/main/java/org/apache/commons/math/analysis/function/Constant.java
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@ -17,7 +17,7 @@
package org.apache.commons.math.analysis.function;
import org.apache.commons.math.analysis.UnivariateRealFunction;
import org.apache.commons.math.analysis.DifferentiableUnivariateRealFunction;
/**
* Constant function.
@ -25,7 +25,7 @@ import org.apache.commons.math.analysis.UnivariateRealFunction;
* @version $Id$
* @since 3.0
*/
public class Constant implements UnivariateRealFunction {
public class Constant implements DifferentiableUnivariateRealFunction {
/** Constant. */
private final double c;
@ -40,4 +40,9 @@ public class Constant implements UnivariateRealFunction {
public double value(double x) {
return c;
}
/** {@inheritDoc} */
public DifferentiableUnivariateRealFunction derivative() {
return new Constant(0);
}
}

13
src/main/java/org/apache/commons/math/analysis/function/Cos.java
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@ -18,6 +18,7 @@
package org.apache.commons.math.analysis.function;
import org.apache.commons.math.analysis.UnivariateRealFunction;
import org.apache.commons.math.analysis.DifferentiableUnivariateRealFunction;
import org.apache.commons.math.util.FastMath;
/**
@ -26,9 +27,19 @@ import org.apache.commons.math.util.FastMath;
* @version $Id$
* @since 3.0
*/
public class Cos implements UnivariateRealFunction {
public class Cos implements DifferentiableUnivariateRealFunction {
/** {@inheritDoc} */
public double value(double x) {
return FastMath.cos(x);
}
/** {@inheritDoc} */
public UnivariateRealFunction derivative() {
return new UnivariateRealFunction() {
/** {@inheritDoc} */
public double value(double x) {
return -FastMath.sin(x);
}
};
}
}

9
src/main/java/org/apache/commons/math/analysis/function/Cosh.java
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@ -17,7 +17,7 @@
package org.apache.commons.math.analysis.function;
import org.apache.commons.math.analysis.UnivariateRealFunction;
import org.apache.commons.math.analysis.DifferentiableUnivariateRealFunction;
import org.apache.commons.math.util.FastMath;
/**
@ -26,9 +26,14 @@ import org.apache.commons.math.util.FastMath;
* @version $Id$
* @since 3.0
*/
public class Cosh implements UnivariateRealFunction {
public class Cosh implements DifferentiableUnivariateRealFunction {
/** {@inheritDoc} */
public double value(double x) {
return FastMath.cosh(x);
}
/** {@inheritDoc} */
public DifferentiableUnivariateRealFunction derivative() {
return new Sinh();
}
}

13
src/main/java/org/apache/commons/math/analysis/function/Exp.java
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@ -18,6 +18,7 @@
package org.apache.commons.math.analysis.function;
import org.apache.commons.math.analysis.UnivariateRealFunction;
import org.apache.commons.math.analysis.DifferentiableUnivariateRealFunction;
import org.apache.commons.math.util.FastMath;
/**
@ -26,9 +27,19 @@ import org.apache.commons.math.util.FastMath;
* @version $Id$
* @since 3.0
*/
public class Exp implements UnivariateRealFunction {
public class Exp implements DifferentiableUnivariateRealFunction {
/** {@inheritDoc} */
public double value(double x) {
return FastMath.exp(x);
}
/** {@inheritDoc} */
public UnivariateRealFunction derivative() {
return new UnivariateRealFunction() {
/** {@inheritDoc} */
public double value(double x) {
return FastMath.exp(x);
}
};
}
}

13
src/main/java/org/apache/commons/math/analysis/function/Expm1.java
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@ -18,6 +18,7 @@
package org.apache.commons.math.analysis.function;
import org.apache.commons.math.analysis.UnivariateRealFunction;
import org.apache.commons.math.analysis.DifferentiableUnivariateRealFunction;
import org.apache.commons.math.util.FastMath;
/**
@ -26,9 +27,19 @@ import org.apache.commons.math.util.FastMath;
* @version $Id$
* @since 3.0
*/
public class Expm1 implements UnivariateRealFunction {
public class Expm1 implements DifferentiableUnivariateRealFunction {
/** {@inheritDoc} */
public double value(double x) {
return FastMath.expm1(x);
}
/** {@inheritDoc} */
public UnivariateRealFunction derivative() {
return new UnivariateRealFunction() {
/** {@inheritDoc} */
public double value(double x) {
return FastMath.exp(x);
}
};
}
}

9
src/main/java/org/apache/commons/math/analysis/function/Identity.java
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@ -17,7 +17,7 @@
package org.apache.commons.math.analysis.function;
import org.apache.commons.math.analysis.UnivariateRealFunction;
import org.apache.commons.math.analysis.DifferentiableUnivariateRealFunction;
/**
* Identity function.
@ -25,9 +25,14 @@ import org.apache.commons.math.analysis.UnivariateRealFunction;
* @version $Id$
* @since 3.0
*/
public class Identity implements UnivariateRealFunction {
public class Identity implements DifferentiableUnivariateRealFunction {
/** {@inheritDoc} */
public double value(double x) {
return x;
}
/** {@inheritDoc} */
public DifferentiableUnivariateRealFunction derivative() {
return new Constant(1);
}
}

13
src/main/java/org/apache/commons/math/analysis/function/Inverse.java
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@ -18,6 +18,7 @@
package org.apache.commons.math.analysis.function;
import org.apache.commons.math.analysis.UnivariateRealFunction;
import org.apache.commons.math.analysis.DifferentiableUnivariateRealFunction;
/**
* Inverse function.
@ -25,9 +26,19 @@ import org.apache.commons.math.analysis.UnivariateRealFunction;
* @version $Id$
* @since 3.0
*/
public class Inverse implements UnivariateRealFunction {
public class Inverse implements DifferentiableUnivariateRealFunction {
/** {@inheritDoc} */
public double value(double x) {
return 1 / x;
}
/** {@inheritDoc} */
public UnivariateRealFunction derivative() {
return new UnivariateRealFunction() {
/** {@inheritDoc} */
public double value(double x) {
return -1 / (x * x);
}
};
}
}

13
src/main/java/org/apache/commons/math/analysis/function/Log.java
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@ -18,6 +18,7 @@
package org.apache.commons.math.analysis.function;
import org.apache.commons.math.analysis.UnivariateRealFunction;
import org.apache.commons.math.analysis.DifferentiableUnivariateRealFunction;
import org.apache.commons.math.util.FastMath;
/**
@ -26,9 +27,19 @@ import org.apache.commons.math.util.FastMath;
* @version $Id$
* @since 3.0
*/
public class Log implements UnivariateRealFunction {
public class Log implements DifferentiableUnivariateRealFunction {
/** {@inheritDoc} */
public double value(double x) {
return FastMath.log(x);
}
/** {@inheritDoc} */
public UnivariateRealFunction derivative() {
return new UnivariateRealFunction() {
/** {@inheritDoc} */
public double value(double x) {
return 1 / x;
}
};
}
}

13
src/main/java/org/apache/commons/math/analysis/function/Log1p.java
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@ -18,6 +18,7 @@
package org.apache.commons.math.analysis.function;
import org.apache.commons.math.analysis.UnivariateRealFunction;
import org.apache.commons.math.analysis.DifferentiableUnivariateRealFunction;
import org.apache.commons.math.util.FastMath;
/**
@ -26,9 +27,19 @@ import org.apache.commons.math.util.FastMath;
* @version $Id$
* @since 3.0
*/
public class Log1p implements UnivariateRealFunction {
public class Log1p implements DifferentiableUnivariateRealFunction {
/** {@inheritDoc} */
public double value(double x) {
return FastMath.log1p(x);
}
/** {@inheritDoc} */
public UnivariateRealFunction derivative() {
return new UnivariateRealFunction() {
/** {@inheritDoc} */
public double value(double x) {
return 1 / (1 + x);
}
};
}
}

13
src/main/java/org/apache/commons/math/analysis/function/Power.java
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@ -18,6 +18,7 @@
package org.apache.commons.math.analysis.function;
import org.apache.commons.math.analysis.UnivariateRealFunction;
import org.apache.commons.math.analysis.DifferentiableUnivariateRealFunction;
import org.apache.commons.math.util.FastMath;
/**
@ -26,7 +27,7 @@ import org.apache.commons.math.util.FastMath;
* @version $Id$
* @since 3.0
*/
public class Power implements UnivariateRealFunction {
public class Power implements DifferentiableUnivariateRealFunction {
/** Power. */
private final double p;
@ -41,4 +42,14 @@ public class Power implements UnivariateRealFunction {
public double value(double x) {
return FastMath.pow(x, p);
}
/** {@inheritDoc} */
public UnivariateRealFunction derivative() {
return new UnivariateRealFunction() {
/** {@inheritDoc} */
public double value(double x) {
return p * FastMath.pow(x, p - 1);
}
};
}
}

9
src/main/java/org/apache/commons/math/analysis/function/Sin.java
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@ -17,7 +17,7 @@
package org.apache.commons.math.analysis.function;
import org.apache.commons.math.analysis.UnivariateRealFunction;
import org.apache.commons.math.analysis.DifferentiableUnivariateRealFunction;
import org.apache.commons.math.util.FastMath;
/**
@ -26,9 +26,14 @@ import org.apache.commons.math.util.FastMath;
* @version $Id$
* @since 3.0
*/
public class Sin implements UnivariateRealFunction {
public class Sin implements DifferentiableUnivariateRealFunction {
/** {@inheritDoc} */
public double value(double x) {
return FastMath.sin(x);
}
/** {@inheritDoc} */
public DifferentiableUnivariateRealFunction derivative() {
return new Cos();
}
}

9
src/main/java/org/apache/commons/math/analysis/function/Sinh.java
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@ -17,7 +17,7 @@
package org.apache.commons.math.analysis.function;
import org.apache.commons.math.analysis.UnivariateRealFunction;
import org.apache.commons.math.analysis.DifferentiableUnivariateRealFunction;
import org.apache.commons.math.util.FastMath;
/**
@ -26,9 +26,14 @@ import org.apache.commons.math.util.FastMath;
* @version $Id$
* @since 3.0
*/
public class Sinh implements UnivariateRealFunction {
public class Sinh implements DifferentiableUnivariateRealFunction {
/** {@inheritDoc} */
public double value(double x) {
return FastMath.sinh(x);
}
/** {@inheritDoc} */
public DifferentiableUnivariateRealFunction derivative() {
return new Cosh();
}
}

14
src/main/java/org/apache/commons/math/analysis/function/Tan.java
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@ -18,6 +18,7 @@
package org.apache.commons.math.analysis.function;
import org.apache.commons.math.analysis.UnivariateRealFunction;
import org.apache.commons.math.analysis.DifferentiableUnivariateRealFunction;
import org.apache.commons.math.util.FastMath;
/**
@ -26,9 +27,20 @@ import org.apache.commons.math.util.FastMath;
* @version $Id$
* @since 3.0
*/
public class Tan implements UnivariateRealFunction {
public class Tan implements DifferentiableUnivariateRealFunction {
/** {@inheritDoc} */
public double value(double x) {
return FastMath.tan(x);
}
/** {@inheritDoc} */
public UnivariateRealFunction derivative() {
return new UnivariateRealFunction() {
/** {@inheritDoc} */
public double value(double x) {
final double tanX = FastMath.tan(x);
return 1 + tanX * tanX;
}
};
}
}

14
src/main/java/org/apache/commons/math/analysis/function/Tanh.java
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@ -18,6 +18,7 @@
package org.apache.commons.math.analysis.function;
import org.apache.commons.math.analysis.UnivariateRealFunction;
import org.apache.commons.math.analysis.DifferentiableUnivariateRealFunction;
import org.apache.commons.math.util.FastMath;
/**
@ -26,9 +27,20 @@ import org.apache.commons.math.util.FastMath;
* @version $Id$
* @since 3.0
*/
public class Tanh implements UnivariateRealFunction {
public class Tanh implements DifferentiableUnivariateRealFunction {
/** {@inheritDoc} */
public double value(double x) {
return FastMath.tanh(x);
}
/** {@inheritDoc} */
public UnivariateRealFunction derivative() {
return new UnivariateRealFunction() {
/** {@inheritDoc} */
public double value(double x) {
final double tanhX = FastMath.tanh(x);
return 1 - tanhX * tanhX;
}
};
}
}