[jira] [Created] (SYSTEMML-516) Index Range Slicing Should Allow Implicit Upper Or Lower Bounds

["Mike Dusenberry (JIRA)" <ji...@apache.org>]

Mike Dusenberry created SYSTEMML-516:
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             Summary: Index Range Slicing Should Allow Implicit Upper Or Lower Bounds
                 Key: SYSTEMML-516
                 URL: https://issues.apache.org/jira/browse/SYSTEMML-516
             Project: SystemML
          Issue Type: Improvement
            Reporter: Mike Dusenberry


DML allows for index slicing of matrices for specified ranges, as in {{X[1:4, 2:6]}}.  However, this currently requires that *both* a lower *and* upper bound be specified.  It would be useful to be able to specify *either* a lower *or* upper bound, with the missing bound implicitly added internally.  This would allow for scenarios such as selecting all columns *except* the first one, as in
{code}
data = rand(rows=10, cols=20, min=0, max=1, pdf="uniform", sparsity=0.2)
X = X[,2:]  # select all rows, and all columns except the first one
{code}.



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