A using Gaussian elimination with partial pivoting. A used in the computation. On Return a is the m by n transformed matrix A , containing the results of the factorization. In your C program, argument info must be passed by reference.
L is a unit lower triangular matrix.
U is an upper triangular matrix. P is the permutation matrix. If m or n is 0, no computation is performed and the subroutine returns after doing some parameter checking. Error Conditions Resource Errors Unable to allocate internal work area. Computational Errors Matrix A is singular.