Mercurial > dive4elements > river
diff artifacts/src/main/java/org/dive4elements/river/artifacts/math/fitting/Function.java @ 5838:5aa05a7a34b7
Rename modules to more fitting names.
author | Sascha L. Teichmann <teichmann@intevation.de> |
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date | Thu, 25 Apr 2013 15:23:37 +0200 |
parents | flys-artifacts/src/main/java/org/dive4elements/river/artifacts/math/fitting/Function.java@bd047b71ab37 |
children | 4897a58c8746 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/artifacts/src/main/java/org/dive4elements/river/artifacts/math/fitting/Function.java Thu Apr 25 15:23:37 2013 +0200 @@ -0,0 +1,100 @@ +package org.dive4elements.river.artifacts.math.fitting; + +import org.apache.commons.math.FunctionEvaluationException; + +import org.apache.commons.math.optimization.fitting.ParametricRealFunction; + +import org.dive4elements.river.utils.DoubleUtil; + +public abstract class Function +implements ParametricRealFunction +{ + protected String name; + protected String description; + protected String [] parameterNames; + protected double [] initialGuess; + + public static abstract class Derivative { + + protected String description; + + public Derivative() { + } + + public Derivative(String description) { + this.description = description; + } + + public String getDescription() { + return description; + } + + public abstract org.dive4elements.river.artifacts.math.Function + instantiate(double [] parameters); + + } // interface Derivative + + public Function() { + } + + public Function( + String name, + String description, + String [] parameterNames + ) { + this(name, + description, + parameterNames, + DoubleUtil.fill(parameterNames.length, 1d)); + } + + public Function( + String name, + String description, + String [] parameterNames, + double [] initialGuess + ) { + this.name = name; + this.description = description; + this.parameterNames = parameterNames; + this.initialGuess = initialGuess; + } + + public String getName() { + return name; + } + + public String getDescription() { + return description; + } + + public String [] getParameterNames() { + return parameterNames; + } + + public double [] getInitialGuess() { + return initialGuess; + } + + public org.dive4elements.river.artifacts.math.Function instantiate( + final double [] parameters + ) { + return new org.dive4elements.river.artifacts.math.Function() { + + @Override + public double value(double x) { + try { + return Function.this.value(x, parameters); + } + catch (FunctionEvaluationException fee) { + return Double.NaN; + } + } + }; + } + + public abstract Derivative getDerivative(); + + public abstract Function getInverse(); +} +// vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :