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From "Gilles (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MATH-645) MathRuntimeException with simple ebeMultiply on OpenMapRealVector
Date Sat, 13 Aug 2011 18:14:27 GMT

    [ https://issues.apache.org/jira/browse/MATH-645?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13084678#comment-13084678
] 

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: S├ębastien 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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