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Smath does not support reverse cols order in "submatrix". Alternately, here is the module. Read more in the attached. Jean   Utilities Matrix Mirror Exercise.sm (20kb) downloaded 20 time(s).
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When Sisyphus climbed to the top of a hill, they said: "Wrong boulder!" |
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You even don't have to wait for the vector indices, at least for the mirror. See here The mirror implementation is straightforward to understand (transpose, reverse, transpose) The diagonal is a nasty indexing trick, which is that far from paper and pencil notation that it can't be recommended unless you want to obfuscate your algorithm (then best use excel). You just square the row/column index range elements to access the diagonal elements in linear indexing. This, however, uses the vector index feature. Edited by user 09 September 2016 18:35:03(UTC)
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Originally Posted by: mkraska  The diagonal is a nasty indexing trick, which is that far from paper and pencil notation that it can't be recommended unless you want to obfuscate your algorithm (then best use excel). You just square the row/column index range elements to access the diagonal elements in linear indexing.
This, however, uses the vector index feature. diagonal(M):el(M,(range(0,(rows(M)-1)))*(rows(M)+1)+1)  Edited by user 11 September 2016 11:13:28(UTC)
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Best regards,
Mike Kaganski |
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