Mercurial > dive4elements > river
diff flys-artifacts/src/main/java/de/intevation/flys/artifacts/math/fitting/Exp.java @ 3009:4dda67a893da
FixA: Added the derivatives of all fitting functions.
flys-artifacts/trunk@4565 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
---|---|
date | Thu, 31 May 2012 16:32:03 +0000 |
parents | 0dd58ab7e118 |
children | 585c0b49e696 |
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--- a/flys-artifacts/src/main/java/de/intevation/flys/artifacts/math/fitting/Exp.java Wed May 30 17:59:19 2012 +0000 +++ b/flys-artifacts/src/main/java/de/intevation/flys/artifacts/math/fitting/Exp.java Thu May 31 16:32:03 2012 +0000 @@ -3,6 +3,25 @@ public class Exp extends Function { + public static final Derivative DERIVATIVE = + new Derivative("W'(Q) = a^Q*log(a)*m") { + + @Override + public de.intevation.flys.artifacts.math.Function + instantiate(double [] parameters) + { + final double m = parameters[0]; + final double a = parameters[1]; + + return new de.intevation.flys.artifacts.math.Function() { + @Override + public double value(double Q) { + return Math.pow(a, Q)*Math.log(a)*m; + } + }; + } + }; + public Exp() { super( "exp", @@ -23,5 +42,10 @@ 1d }; } + + @Override + public Derivative getDerivative() { + return DERIVATIVE; + } } // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :