dsptrs (3p)

Name

dsptrs - ric matrix A stored in packed format using the factorization A = U*D*U**T or A = L*D*L**T computed by DSPTRF

Synopsis

SUBROUTINE DSPTRS(UPLO, N, NRHS, AP, IPIVOT, B, LDB, INFO)

CHARACTER*1 UPLO
INTEGER N, NRHS, LDB, INFO
INTEGER IPIVOT(*)
DOUBLE PRECISION AP(*), B(LDB,*)

SUBROUTINE DSPTRS_64(UPLO, N, NRHS, AP, IPIVOT, B, LDB, INFO)

CHARACTER*1 UPLO
INTEGER*8 N, NRHS, LDB, INFO
INTEGER*8 IPIVOT(*)
DOUBLE PRECISION AP(*), B(LDB,*)




F95 INTERFACE
SUBROUTINE SPTRS(UPLO, N, NRHS, AP, IPIVOT, B, LDB, INFO)

CHARACTER(LEN=1) :: UPLO
INTEGER :: N, NRHS, LDB, INFO
INTEGER, DIMENSION(:) :: IPIVOT
REAL(8), DIMENSION(:) :: AP
REAL(8), DIMENSION(:,:) :: B

SUBROUTINE SPTRS_64(UPLO, N, NRHS, AP, IPIVOT, B, LDB, INFO)

CHARACTER(LEN=1) :: UPLO
INTEGER(8) :: N, NRHS, LDB, INFO
INTEGER(8), DIMENSION(:) :: IPIVOT
REAL(8), DIMENSION(:) :: AP
REAL(8), DIMENSION(:,:) :: B




C INTERFACE
#include <sunperf.h>

void dsptrs(char uplo, int n, int nrhs, double *ap, int *ipivot, double
*b, int ldb, int *info);

void dsptrs_64(char uplo, long n, long nrhs, double *ap, long  *ipivot,
double *b, long ldb, long *info);

Description

Oracle Solaris Studio Performance Library                           dsptrs(3P)



NAME
       dsptrs - solve a system of linear equations A*X = B with a real symmet-
       ric matrix A stored in  packed  format  using  the  factorization  A  =
       U*D*U**T or A = L*D*L**T computed by DSPTRF


SYNOPSIS
       SUBROUTINE DSPTRS(UPLO, N, NRHS, AP, IPIVOT, B, LDB, INFO)

       CHARACTER*1 UPLO
       INTEGER N, NRHS, LDB, INFO
       INTEGER IPIVOT(*)
       DOUBLE PRECISION AP(*), B(LDB,*)

       SUBROUTINE DSPTRS_64(UPLO, N, NRHS, AP, IPIVOT, B, LDB, INFO)

       CHARACTER*1 UPLO
       INTEGER*8 N, NRHS, LDB, INFO
       INTEGER*8 IPIVOT(*)
       DOUBLE PRECISION AP(*), B(LDB,*)




   F95 INTERFACE
       SUBROUTINE SPTRS(UPLO, N, NRHS, AP, IPIVOT, B, LDB, INFO)

       CHARACTER(LEN=1) :: UPLO
       INTEGER :: N, NRHS, LDB, INFO
       INTEGER, DIMENSION(:) :: IPIVOT
       REAL(8), DIMENSION(:) :: AP
       REAL(8), DIMENSION(:,:) :: B

       SUBROUTINE SPTRS_64(UPLO, N, NRHS, AP, IPIVOT, B, LDB, INFO)

       CHARACTER(LEN=1) :: UPLO
       INTEGER(8) :: N, NRHS, LDB, INFO
       INTEGER(8), DIMENSION(:) :: IPIVOT
       REAL(8), DIMENSION(:) :: AP
       REAL(8), DIMENSION(:,:) :: B




   C INTERFACE
       #include <sunperf.h>

       void dsptrs(char uplo, int n, int nrhs, double *ap, int *ipivot, double
                 *b, int ldb, int *info);

       void dsptrs_64(char uplo, long n, long nrhs, double *ap, long  *ipivot,
                 double *b, long ldb, long *info);



PURPOSE
       dsptrs  solves a system of linear equations A*X = B with a real symmet-
       ric matrix A stored in  packed  format  using  the  factorization  A  =
       U*D*U**T or A = L*D*L**T computed by DSPTRF.


ARGUMENTS
       UPLO (input)
                 Specifies whether the details of the factorization are stored
                 as an upper or lower triangular matrix.  = 'U':  Upper trian-
                 gular, form is A = U*D*U**T;
                 = 'L':  Lower triangular, form is A = L*D*L**T.


       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.


       AP (input)
                 Double precision array, dimension (N*(N+1)/2) The block diag-
                 onal matrix D and the multipliers used to obtain the factor U
                 or L as computed by DSPTRF, stored  as  a  packed  triangular
                 matrix.


       IPIVOT (input)
                 Integer  array, dimension (N) Details of the interchanges and
                 the block structure of D as determined by DSPTRF.


       B (input/output)
                 Double precision array, dimension (LDB,NRHS)  On  entry,  the
                 right hand side matrix B.  On exit, the solution 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                        dsptrs(3P)