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);

Description

Oracle Solaris Studio 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)


       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




                                  7 Nov 2015                        sgetrs(3P)