MathRuntimeException with simple ebeMultiply on OpenMapRealVector
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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
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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