Provided by: liblapack-doc_3.3.1-1_all NAME

LAPACK-3  -  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
SSPTRF

SYNOPSIS

SUBROUTINE SSPTRS( UPLO, N, NRHS, AP, IPIV, B, LDB, INFO )

CHARACTER      UPLO

INTEGER        INFO, LDB, N, NRHS

INTEGER        IPIV( * )

REAL           AP( * ), B( LDB, * )

PURPOSE

SSPTRS  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 SSPTRF.

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) REAL 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 SSPTRF, stored as a
packed triangular matrix.

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

B       (input/output) REAL 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 routine (version 3.3.1)             April 2011                            SSPTRS(3lapack)