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Mike Dusenberry updated SYSTEMML-516: ------------------------------------- Description: 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}. was: 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}. > 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}. -- This message was sent by Atlassian JIRA (v6.3.4#6332)