Matthias Boehm created SYSTEMML-1008:
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Summary: RemoveEmtpy w/ selection vector and nnz=0 produces wrong
output
Key: SYSTEMML-1008
URL: https://issues.apache.org/jira/browse/SYSTEMML-1008
Project: SystemML
Issue Type: Bug
Reporter: Matthias Boehm
Priority: Blocker
RemoveEmtpy with selection vector always has to respect the selection vector
over the actual data. If the input matrix has no non-zero entries, however, we
currently produce incorrect results of an empty row/column output vector.
For example, the following script should print {{nrow (A) = 10, nrow (C) =
10}} but prints {{nrow (A) = 10, nrow (C) = 1}}.
{code}
A = matrix (0, rows = 10, cols = 1);
B = matrix (1, rows = 10, cols = 1);
C = removeEmpty (target = A, margin = "rows", select = B);
print ("nrow (A) = " + nrow (A) + ", nrow (C) = " + nrow (C));
{code}
Thanks to [~ae2015] for catching this.
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