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Added "derivative". 

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/math/trunk@1184941 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Gilles Sadowski 2011-10-16 21:49:02 +00:00
parent 9092e81cae
commit 6f81d04ef7
1 changed files with 7 additions and 2 deletions
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9
src/main/java/org/apache/commons/math/analysis/function/Minus.java
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@ -17,7 +17,7 @@
package org.apache.commons.math.analysis.function; package org.apache.commons.math.analysis.function;
import org.apache.commons.math.analysis.UnivariateRealFunction; import org.apache.commons.math.analysis.DifferentiableUnivariateRealFunction;
/** /**
* Minus function. * Minus function.
@ -25,9 +25,14 @@ import org.apache.commons.math.analysis.UnivariateRealFunction;
* @version $Id$ * @version $Id$
* @since 3.0 * @since 3.0
*/ */
public class Minus implements UnivariateRealFunction { public class Minus implements DifferentiableUnivariateRealFunction {
/** {@inheritDoc} */ /** {@inheritDoc} */
public double value(double x) { public double value(double x) {
return -x; return -x;
} }
/** {@inheritDoc} */
public DifferentiableUnivariateRealFunction derivative() {
return new Constant(-1);
}
} }