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https://issues.apache.org/jira/browse/MAHOUT-1146?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13598806#comment-13598806
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Hudson commented on MAHOUT-1146:
--------------------------------
Integrated in Mahout-Quality #1895 (See
[https://builds.apache.org/job/Mahout-Quality/1895/])
MAHOUT-1146 Cardinality exception bug in 'cross' method of AbstractVector
class (Revision 1455106)
Result = SUCCESS
ssc : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1455106
Files :
* /mahout/trunk/math/src/main/java/org/apache/mahout/math/MatrixVectorView.java
*
/mahout/trunk/math/src/test/java/org/apache/mahout/math/MatrixVectorViewTest.java
> Cardinality exception bug in 'cross' method of AbstractVector class.
> --------------------------------------------------------------------
>
> Key: MAHOUT-1146
> URL: https://issues.apache.org/jira/browse/MAHOUT-1146
> Project: Mahout
> Issue Type: Bug
> Components: Math
> Affects Versions: 0.8
> Environment: Ubuntu 12.10 64-bit
> Reporter: Ceyhun Can Ülker
> Assignee: Sebastian Schelter
> Priority: Critical
> Labels: cross, math, matrix, vector
> Original Estimate: 1h
> Remaining Estimate: 1h
>
> This bug is probably about the viewColumn method, or matrixLike method or
> MatrixVectorView constructor, I didn't really looked into it. But it is easy
> to reproduce.
> I have a dense matrix U of size 10x670. When I try to do this I get a
> cardinality exception, which doesn't make sense:
> Vector uI = U.viewColumn(i);
> Matrix outerProduct = uI.cross(uI);
> Exception is thrown from AbstractMatrix class' cross method, when a row is
> tried to be assigned in the result matrix.
> public Matrix cross(Vector other) {
> Matrix result = matrixLike(size, other.size());
> for (int row = 0; row < size; row++) {
> result.assignRow(row, other.times(getQuick(row)));
> }
> return result;
> }
> The problem here is matrixLike method does not return a 10x10 matrix as it
> should, instead it returns 1x1 matrix.
> Hope this helps.
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