redhat man page for sgetrs

SGETRS(l)								 )								 SGETRS(l)

NAME
       SGETRS  -  solve a system of linear equations A * X = B or A' * X = B with a general N-by-N matrix A using the LU factorization computed by
       SGETRF

SYNOPSIS
       SUBROUTINE SGETRS( TRANS, N, NRHS, A, LDA, IPIV, B, LDB, INFO )

	   CHARACTER	  TRANS

	   INTEGER	  INFO, LDA, LDB, N, NRHS

	   INTEGER	  IPIV( * )

	   REAL 	  A( LDA, * ), B( LDB, * )

PURPOSE
       SGETRS solves a system of linear equations A * X = B or A' * X = B with a general N-by-N matrix A using the LU  factorization  computed	by
       SGETRF.

ARGUMENTS
       TRANS   (input) CHARACTER*1
	       Specifies the form of the system of equations:
	       = 'N':  A * X = B  (No transpose)
	       = 'T':  A'* X = B  (Transpose)
	       = 'C':  A'* X = B  (Conjugate transpose = Transpose)

       N       (input) INTEGER
	       The order of the matrix A.  N >= 0.

       NRHS    (input) INTEGER
	       The number of right hand sides, i.e., the number of columns of the matrix B.  NRHS >= 0.

       A       (input) REAL array, dimension (LDA,N)
	       The factors L and U from the factorization A = P*L*U as computed by SGETRF.

       LDA     (input) INTEGER
	       The leading dimension of the array A.  LDA >= max(1,N).

       IPIV    (input) INTEGER array, dimension (N)
	       The pivot indices from SGETRF; for 1<=i<=N, row i of the matrix was interchanged with row IPIV(i).

       B       (input/output) REAL array, dimension (LDB,NRHS)
	       On entry, the right hand side matrix B.	On exit, the solution matrix X.

       LDB     (input) INTEGER
	       The leading dimension of the array B.  LDB >= max(1,N).

       INFO    (output) INTEGER
	       = 0:  successful exit
	       < 0:  if INFO = -i, the i-th argument had an illegal value

LAPACK version 3.0						   15 June 2000 							 SGETRS(l)