[MATH-645] MathRuntimeException with simple ebeMultiply on OpenMapRealVector

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.0
• Fix Version/s: 3.0
• Labels: linear sparse vector
• Assignee: Unassigned
• Reporter: Sebastien Brisard
• Created: 13/Aug/11 16:18
• Updated: 24/Mar/12 16:16
• Resolved: 02/Sep/11 20:54

Description

The following piece of code

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));
    }
}

raises an exception

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)