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https://issues.apache.org/jira/browse/MAHOUT-1630?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14484710#comment-14484710
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ASF GitHub Bot commented on MAHOUT-1630:
----------------------------------------
Github user asfgit closed the pull request at:
https://github.com/apache/mahout/pull/115
> Incorrect SparseColumnMatrix.numSlices() causes IndexException in toString()
> ----------------------------------------------------------------------------
>
> Key: MAHOUT-1630
> URL: https://issues.apache.org/jira/browse/MAHOUT-1630
> Project: Mahout
> Issue Type: Bug
> Components: Math
> Affects Versions: 0.9
> Reporter: Oleg Nitz
> Assignee: Suneel Marthi
> Labels: legacy, math, scala
> Fix For: 0.10.0
>
>
> SparseColumnMatrix overrides the numSlices() method incorrectly: it returns
> numCols() instead of numRows().
> As a result, AbstractMaxtrix.toString() for wide matrices throws an exception.
> For example, this code:
> {quote}
> Matrix matrix = new SparseColumnMatrix(1, 2);
> matrix.toString();
> {quote}
> causes
> {quote}
> org.apache.mahout.math.IndexException: Index 1 is outside allowable range of
> [0,1)
> at
> org.apache.mahout.math.MatrixVectorView.<init>(MatrixVectorView.java:42)
> at
> org.apache.mahout.math.AbstractMatrix.viewRow(AbstractMatrix.java:290)
> at
> org.apache.mahout.math.AbstractMatrix$1.computeNext(AbstractMatrix.java:68)
> at
> org.apache.mahout.math.AbstractMatrix$1.computeNext(AbstractMatrix.java:59)
> at
> com.google.common.collect.AbstractIterator.tryToComputeNext(AbstractIterator.java:143)
> at
> com.google.common.collect.AbstractIterator.hasNext(AbstractIterator.java:138)
> at
> org.apache.mahout.math.AbstractMatrix.toString(AbstractMatrix.java:787)
> {quote}
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