Till Rohrmann created MAHOUT-1415:
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Summary: Clone method on sparse matrices fails if there is an
empty row which has not been set explicitly
Key: MAHOUT-1415
URL: https://issues.apache.org/jira/browse/MAHOUT-1415
Project: Mahout
Issue Type: Bug
Components: Math
Affects Versions: 1.0
Environment: Mac OS X Mavericks, Darwin Kernel Version 13.0.2
Reporter: Till Rohrmann
Priority: Minor
Fix For: 1.0
The clone method of the SparseMatrix class fails with a NullPointerException if
there exists an empty row in the matrix which has not been explicitly set. The
reason for this problem is that the clone operation iterates over all rows and
clones them whether there exists a Vector instance for this row or not. The
problem should be easily fixed by iterating only over the existing matrix
slices.
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