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sgetrs(3P)		    Sun Performance Library		    sgetrs(3P)

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(TRANSA, N, NRHS, A, LDA, IPIVOT, B, LDB, INFO)

       CHARACTER * 1 TRANSA
       INTEGER N, NRHS, LDA, LDB, INFO
       INTEGER IPIVOT(*)
       REAL A(LDA,*), B(LDB,*)

       SUBROUTINE SGETRS_64(TRANSA, N, NRHS, A, LDA, IPIVOT, B, LDB, INFO)

       CHARACTER * 1 TRANSA
       INTEGER*8 N, NRHS, LDA, LDB, INFO
       INTEGER*8 IPIVOT(*)
       REAL A(LDA,*), B(LDB,*)

   F95 INTERFACE
       SUBROUTINE GETRS([TRANSA], [N], [NRHS], A, [LDA], IPIVOT, B, [LDB],
	      [INFO])

       CHARACTER(LEN=1) :: TRANSA
       INTEGER :: N, NRHS, LDA, LDB, INFO
       INTEGER, DIMENSION(:) :: IPIVOT
       REAL, DIMENSION(:,:) :: A, B

       SUBROUTINE GETRS_64([TRANSA], [N], [NRHS], A, [LDA], IPIVOT, B, [LDB],
	      [INFO])

       CHARACTER(LEN=1) :: TRANSA
       INTEGER(8) :: N, NRHS, LDA, LDB, INFO
       INTEGER(8), DIMENSION(:) :: IPIVOT
       REAL, DIMENSION(:,:) :: A, B

   C INTERFACE
       #include <sunperf.h>

       void  sgetrs(char  transa,  int	n,  int	 nrhs,	float *a, int lda, int
		 *ipivot, float *b, int ldb, int *info);

       void sgetrs_64(char transa, long n, long nrhs, float *a, long lda, long
		 *ipivot, float *b, long ldb, long *info);

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
       TRANSA (input)
		 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)

		 TRANSA is defaulted to 'N' for F95 INTERFACE.

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

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

       A (input) The  factors L and U from the factorization A = P*L*U as com‐
		 puted by SGETRF.

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

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

       B (input/output)
		 On  entry,  the right hand side matrix B.  On exit, the solu‐
		 tion matrix X.

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

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

				  6 Mar 2009			    sgetrs(3P)

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