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From S├ębastien Brisard (JIRA) <j...@apache.org>
Subject [jira] [Created] (MATH-645) MathRuntimeException with simple ebeMultiply on OpenMapRealVector
Date Sat, 13 Aug 2011 16:20:27 GMT
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


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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