NAME

       dsptrs.f -

SYNOPSIS

   Functions/Subroutines
       subroutine dsptrs (UPLO, N, NRHS, AP, IPIV, B, LDB, INFO)
           DSPTRS

Function/Subroutine Documentation

   subroutine dsptrs (character UPLO, integer N, integer NRHS, double precision, dimension( * )
       AP, integer, dimension( * ) IPIV, double precision, dimension( ldb, * ) B, integer LDB,
       integer INFO)
       DSPTRS

       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.

       Parameters:
           UPLO

                     UPLO is 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

                     N is INTEGER
                     The order of the matrix A.  N >= 0.

           NRHS

                     NRHS is INTEGER
                     The number of right hand sides, i.e., the number of columns
                     of the matrix B.  NRHS >= 0.

           AP

                     AP is 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 triangular matrix.

           IPIV

                     IPIV is INTEGER array, dimension (N)
                     Details of the interchanges and the block structure of D
                     as determined by DSPTRF.

           B

                     B is DOUBLE PRECISION array, dimension (LDB,NRHS)
                     On entry, the right hand side matrix B.
                     On exit, the solution matrix X.

           LDB

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

           INFO

                     INFO is INTEGER
                     = 0:  successful exit
                     < 0: if INFO = -i, the i-th argument had an illegal value

       Author:
           Univ. of Tennessee

           Univ. of California Berkeley

           Univ. of Colorado Denver

           NAG Ltd.

       Date:
           November 2011

Author

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