Implemented upper and lower triangle methods in NumRuby#45

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iamrajiv wants to merge 5 commits intoSciRuby:masterfrom iamrajiv:issue_29

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Commits on Jan 20, 2020

added upper and lower triangular matrix
iamrajiv
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Commits on Apr 15, 2020

Commits on May 17, 2020

change upper case to lower case in parameters
iamrajiv
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