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https://issues.apache.org/jira/browse/SYSTEMML-707?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matthias Boehm reassigned SYSTEMML-707:
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Assignee: Matthias Boehm
> diag not generate square matrix if given Nx1 matrix of zeroes
> -------------------------------------------------------------
>
> Key: SYSTEMML-707
> URL: https://issues.apache.org/jira/browse/SYSTEMML-707
> Project: SystemML
> Issue Type: Bug
> Components: APIs
> Reporter: Deron Eriksson
> Assignee: Matthias Boehm
>
> Thank you Matthew Plourde for finding this!
> If an Nx1 matrix of 0's is given to the diag() function, an Nx1 matrix of 0's
> is returned. However, if an Nx1 matrix consists of any values that aren't
> 0's, an NxN diagonal matrix is returned. This is inconsistent and the Nx1
> matrix of 0's to diag() should probably return an NxN matrix.
> Example 1:
> {code}
> zeroes=matrix(0, 5, 1);
> print(toString(zeroes));
> print(toString(diag(zeroes)));
> {code}
> gives:
> {code}
> 0.000
> 0.000
> 0.000
> 0.000
> 0.000
> 0.000
> 0.000
> 0.000
> 0.000
> 0.000
> {code}
> Example 2:
> {code}
> ones=matrix(1, 5, 1);
> print(toString(ones));
> print(toString(diag(ones)));
> {code}
> gives:
> {code}
> 1.000
> 1.000
> 1.000
> 1.000
> 1.000
> 1.000 0.000 0.000 0.000 0.000
> 0.000 1.000 0.000 0.000 0.000
> 0.000 0.000 1.000 0.000 0.000
> 0.000 0.000 0.000 1.000 0.000
> 0.000 0.000 0.000 0.000 1.000
> {code}
> Example 3:
> {code}
> nums=matrix("0 1 2 3 4", 5, 1);
> print(toString(nums));
> print(toString(diag(nums)));
> {code}
> gives:
> {code}
> 0.000
> 1.000
> 2.000
> 3.000
> 4.000
> 0.000 0.000 0.000 0.000 0.000
> 0.000 1.000 0.000 0.000 0.000
> 0.000 0.000 2.000 0.000 0.000
> 0.000 0.000 0.000 3.000 0.000
> 0.000 0.000 0.000 0.000 4.000
> {code}
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