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. The computational error message may occur multiple times with processing continuing after each error, because the default for the number of allowable errors for error code 2146 is set to be unlimited in the ESSL error option table. This example shows a factorization of a real general matrix A of order 9.