[jira] [Resolved] (SYSTEMML-1008) RemoveEmtpy w/ selection vector and nnz=0 produces wrong output

["Matthias Boehm (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SYSTEMML-1008?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Matthias Boehm resolved SYSTEMML-1008.
--------------------------------------
       Resolution: Fixed
         Assignee: Matthias Boehm
    Fix Version/s: SystemML 0.11

> 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
>            Assignee: Matthias Boehm
>            Priority: Blocker
>             Fix For: SystemML 0.11
>
>
> 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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