isupeene/sparse-matrix — pull request #11 by isupeene (2014-09-25 03:17:55+00:00)
Title: Removed the square constraint from lu decomposition

@bsoetaer
The built-in matrix class still does lu decomposition, even on rectangular matrices. See https://github.com/ruby/ruby/blob/trunk/lib/matrix/lup_decomposition.rb