[jira] [Created] (MAHOUT-1630) Incorrect SparseColumnMatrix.numSlices() causes IndexException in toString()

["Oleg Nitz (JIRA)" <ji...@apache.org>]

Oleg Nitz created MAHOUT-1630:
---------------------------------

             Summary: 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, 1.0
            Reporter: Oleg Nitz


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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