matrix.rb: add Matrix#antisymmetric?
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61775 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
matrix.rb: add Matrix#antisymmetric?
Proposed by Yilo (@yiloo). Patch by Marcus Stollsteimer (@stomar (Marcus Stollsteimer)).
[Fix GH-1788]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61775 b2dd03c8-39d4-4d8f-98ff-823fe69b080e