> > URL: http://svn.apache.org/viewvc?rev=995035&view=rev
> > Log:
> > Removed strict equality comparison.
>
> In some rare cases, strict equality comparison is desired (I don't know
> if it is the case here). In these cases, findbugs can be configured to
> ignore these cases, see the findbugs-exclude-filter.xml file for an example.
I don't know whether it is one of those rare cases. The algorithm
description in ALGOL uses the "=" sign while the FORTRAN implementation (in
the appendix) works around the problem by inversing the checks:
170 IF ((FU.GT.FW).AND.(W.NE.X)) GO TO 180
V = W
FV = FW
W = U
FW = FU
GO TO 10
180 etc.
> > Modified:
> > commons/proper/math/trunk/src/main/java/org/apache/commons/math/optimization/univariate/BrentOptimizer.java
> > URL:
> > http://svn.apache.org/viewvc/commons/proper/math/trunk/src/main/java/org/apache/commons/math/optimization/univariate/BrentOptimizer.java?rev=995035&r1=995034&r2=995035&view=diff
> > ==============================================================================
> > ---
> > commons/proper/math/trunk/src/main/java/org/apache/commons/math/optimization/univariate/BrentOptimizer.java
> > (original)
> > +++
> > commons/proper/math/trunk/src/main/java/org/apache/commons/math/optimization/univariate/BrentOptimizer.java
> > Wed Sep 8 12:51:38 2010
> > @@ -17,6 +17,7 @@
> > package org.apache.commons.math.optimization.univariate;
> >
> > import org.apache.commons.math.FunctionEvaluationException;
> > +import org.apache.commons.math.util.MathUtils;
> > import org.apache.commons.math.util.FastMath;
> > import org.apache.commons.math.exception.NumberIsTooSmallException;
> > import org.apache.commons.math.exception.NotStrictlyPositiveException;
> > @@ -219,12 +220,15 @@ public class BrentOptimizer extends Abst
> > } else {
> > b = u;
> > }
> > - if (fu <= fw || w == x) {
> > + if (fu <= fw ||
> > + MathUtils.equals(w, x)) {
> > v = w;
> > fv = fw;
> > w = u;
> > fw = fu;
> > - } else if (fu <= fv || v == x || v == w) {
> > + } else if (fu <= fv ||
> > + MathUtils.equals(v, x) ||
> > + MathUtils.equals(v, w)) {
> > v = u;
> > fv = fu;
> > }
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