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Posted to dev@commons.apache.org by br...@apache.org on 2005/08/23 05:04:10 UTC
svn commit: r239305 - in /jakarta/commons/proper/math/branches/MATH_1_1:
src/java/org/apache/commons/math/analysis/UnivariateRealSolverImpl.java
xdocs/changes.xml
Author: brentworden
Date: Mon Aug 22 20:04:07 2005
New Revision: 239305
URL: http://svn.apache.org/viewcvs?rev=239305&view=rev
Log:
PR 36232: Added protection against numerical overflow and underflow in the isBracketing method.
Modified:
jakarta/commons/proper/math/branches/MATH_1_1/src/java/org/apache/commons/math/analysis/UnivariateRealSolverImpl.java
jakarta/commons/proper/math/branches/MATH_1_1/xdocs/changes.xml
Modified: jakarta/commons/proper/math/branches/MATH_1_1/src/java/org/apache/commons/math/analysis/UnivariateRealSolverImpl.java
URL: http://svn.apache.org/viewcvs/jakarta/commons/proper/math/branches/MATH_1_1/src/java/org/apache/commons/math/analysis/UnivariateRealSolverImpl.java?rev=239305&r1=239304&r2=239305&view=diff
==============================================================================
--- jakarta/commons/proper/math/branches/MATH_1_1/src/java/org/apache/commons/math/analysis/UnivariateRealSolverImpl.java (original)
+++ jakarta/commons/proper/math/branches/MATH_1_1/src/java/org/apache/commons/math/analysis/UnivariateRealSolverImpl.java Mon Aug 22 20:04:07 2005
@@ -265,7 +265,9 @@
*/
protected boolean isBracketing(double lower, double upper,
UnivariateRealFunction f) throws FunctionEvaluationException {
- return (f.value(lower) * f.value(upper) < 0);
+ double f1 = f.value(lower);
+ double f2 = f.value(upper);
+ return ((f1 > 0 && f2 < 0) || (f1 < 0 && f2 > 0));
}
/**
Modified: jakarta/commons/proper/math/branches/MATH_1_1/xdocs/changes.xml
URL: http://svn.apache.org/viewcvs/jakarta/commons/proper/math/branches/MATH_1_1/xdocs/changes.xml?rev=239305&r1=239304&r2=239305&view=diff
==============================================================================
--- jakarta/commons/proper/math/branches/MATH_1_1/xdocs/changes.xml (original)
+++ jakarta/commons/proper/math/branches/MATH_1_1/xdocs/changes.xml Mon Aug 22 20:04:07 2005
@@ -45,6 +45,9 @@
and numerical utilities, and a PRNG pluggability framework making it
possible to replace the JDK-supplied random number generator in
commons-math (and elsewhere) with alternative PRNG implementations.">
+ <action dev="brentworden" type="fix" issue="36232" due-to="Xiaogang Zhang">
+ Added protection against numerical overflow and underflow in the isBracketing method.
+ </action>
<action dev="brentworden" type="fix" issue="36300" due-to="Nikhil Gupte">
Fixed division by zero error in rounding methods.
</action>
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