redhat man page for dsptrs

DSPTRS(l)								 )								 DSPTRS(l)

NAME
       DSPTRS  -  solve  a  system  of linear equations A*X = B with a real symmetric 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, IPIV, B, LDB, INFO )

	   CHARACTER	  UPLO

	   INTEGER	  INFO, LDB, N, NRHS

	   INTEGER	  IPIV( * )

	   DOUBLE	  PRECISION AP( * ), B( LDB, * )

PURPOSE
       DSPTRS solves a system of linear equations A*X = B with a real symmetric 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) CHARACTER*1
	       Specifies  whether  the	details of the factorization are stored as an upper or lower triangular matrix.  = 'U':  Upper triangular,
	       form is A = U*D*U**T;
	       = 'L':  Lower triangular, form is A = L*D*L**T.

       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.

       AP      (input) DOUBLE PRECISION array, dimension (N*(N+1)/2)
	       The block diagonal matrix D and the multipliers used to obtain the factor U or L as computed by DSPTRF, stored as a packed triangu-
	       lar matrix.

       IPIV    (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) 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 							 DSPTRS(l)