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dsptrs(3P)		    Sun 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

				  6 Mar 2009			    dsptrs(3P)

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