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Fixed too stringent interval check in Brent solver: 

initial guess is now allowed to be at either interval end
JIRA: MATH-347

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/math/trunk@917668 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Luc Maisonobe 2010-03-01 19:38:34 +00:00
parent 46abbb40e1
commit 57c45aca3d
2 changed files with 9 additions and 1 deletions
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6
src/main/java/org/apache/commons/math/analysis/solvers/BrentSolver.java
View File

@ -100,7 +100,11 @@ public class BrentSolver extends UnivariateRealSolverImpl {
throws MaxIterationsExceededException, FunctionEvaluationException {
clearResult();
verifySequence(min, initial, max);
if ((initial < min) || (initial > max)) {
throw MathRuntimeException.createIllegalArgumentException(
"invalid interval, initial value parameters: lower={0}, initial={1}, upper={2}",
min, initial, max);
}
// return the initial guess if it is good enough
double yInitial = f.value(initial);

4
src/site/xdoc/changes.xml
View File

@ -39,6 +39,10 @@ The <action> type attribute can be add,update,fix,remove.
</properties>
<body>
<release version="2.1" date="TBD" description="TBD">
<action dev="luc" type="fix" issue="MATH-347" >
Fixed too stringent interval check in Brent solver: initial guess is now
allowed to be at either interval end
</action>
<action dev="luc" type="add" >
Added a way to compute both the final state in an Initial Value Problem (IVP)
for Ordinary Differential Equations (ODE) and its derivatives with respect to