Substitution.

The single precision LAPACK substitution function is sgetrs (single precision, general matrix, triangular substitution).

It is called by

The arguments are

Trans

(input) means no transpose (solve for ); means transpose (solve for );

n

(input) Number of equations;

nrhs

(input) Number of right hand sides;

A

(input) The the L and U factors of matrix A as given by sgetrf;

lda

(input) leading dimension of matrix A.

Ipiv

(input) n-dimensional integer vector of permutations, as given by sgetrf;

b

(input) the right hand side vector; and (output) the solution . For multiple right hand sides b is a matrix.

ldb

(input) leading dimension of vector b.

Info

(output) the status of factorization. 0=success, means singularity - , means incorrect -th argument.