CSPTRS(3)                  MathKeisan LAPACK routine                 CSPTRS(3)



NAME
       CSPTRS  - a system of linear equations A*X = B with a complex symmetric
       matrix A stored in packed format using the factorization A  =  U*D*U**T
       or A = L*D*L**T computed by CSPTRF

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

           CHARACTER      UPLO

           INTEGER        INFO, LDB, N, NRHS

           INTEGER        IPIV( * )

           COMPLEX        AP( * ), B( LDB, * )

PURPOSE
       CSPTRS  solves a system of linear equations A*X = B with a complex sym-
       metric matrix A stored in packed format using  the  factorization  A  =
       U*D*U**T or A = L*D*L**T computed by CSPTRF.


ARGUMENTS
       UPLO    (input) CHARACTER*1
               Specifies  whether  the details of the factorization are stored
               as an upper or lower triangular matrix.  = 'U':  Upper triangu-
               lar, 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) COMPLEX 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 CSPTRF, 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 CSPTRF.

       B       (input/output) COMPLEX 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 3.1)    November 2006                       CSPTRS(3)