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https://issues.apache.org/jira/browse/MATH-645?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13084678#comment-13084678
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Gilles commented on MATH-645:
-----------------------------
Probably fixed in revision 1157403.
Added a unit test for "ebeMultiply" and "ebeDivide".
> MathRuntimeException with simple ebeMultiply on OpenMapRealVector
> -----------------------------------------------------------------
>
> Key: MATH-645
> URL: https://issues.apache.org/jira/browse/MATH-645
> Project: Commons Math
> Issue Type: Bug
> Affects Versions: 3.0
> Reporter: Sébastien Brisard
> Labels: linear, sparse, vector
>
> The following piece of code
> {code:java}
> import org.apache.commons.math.linear.OpenMapRealVector;
> import org.apache.commons.math.linear.RealVector;
> public class DemoBugOpenMapRealVector {
> public static void main(String[] args) {
> final RealVector u = new OpenMapRealVector(3, 1E-6);
> u.setEntry(0, 1.);
> u.setEntry(1, 0.);
> u.setEntry(2, 2.);
> final RealVector v = new OpenMapRealVector(3, 1E-6);
> v.setEntry(0, 0.);
> v.setEntry(1, 3.);
> v.setEntry(2, 0.);
> System.out.println(u);
> System.out.println(v);
> System.out.println(u.ebeMultiply(v));
> }
> }
> {code}
> raises an exception
> {noformat}
> org.apache.commons.math.linear.OpenMapRealVector@7170a9b6
> Exception in thread "main" org.apache.commons.math.MathRuntimeException$6:
> map has been modified while iterating
> at
> org.apache.commons.math.MathRuntimeException.createConcurrentModificationException(MathRuntimeException.java:373)
> at
> org.apache.commons.math.util.OpenIntToDoubleHashMap$Iterator.advance(OpenIntToDoubleHashMap.java:564)
> at
> org.apache.commons.math.linear.OpenMapRealVector.ebeMultiply(OpenMapRealVector.java:372)
> at
> org.apache.commons.math.linear.OpenMapRealVector.ebeMultiply(OpenMapRealVector.java:1)
> at DemoBugOpenMapRealVector.main(DemoBugOpenMapRealVector.java:17)
> {noformat}
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