liebke/incanter — pull request #136 by nbeloglazov (2013-04-17 23:31:05+00:00)
Title: Return permutation matrix in LU decomposition.

Current LU decomposition implementation is useless without permutation matrix P because A = L*U is incorrect, correct formula: A = P*L*U: [LU decomposition](http://en.wikipedia.org/wiki/Lu_decomposition)