NAME

       zpptrs.f -

SYNOPSIS

   Functions/Subroutines
       subroutine zpptrs (UPLO, N, NRHS, AP, B, LDB, INFO)
           ZPPTRS

Function/Subroutine Documentation

   subroutine zpptrs (character UPLO, integer N, integer NRHS, complex*16, dimension( * ) AP,
       complex*16, dimension( ldb, * ) B, integer LDB, integer INFO)
       ZPPTRS

       Purpose:

            ZPPTRS solves a system of linear equations A*X = B with a Hermitian
            positive definite matrix A in packed storage using the Cholesky
            factorization A = U**H * U or A = L * L**H computed by ZPPTRF.

       Parameters:
           UPLO

                     UPLO is CHARACTER*1
                     = 'U':  Upper triangle of A is stored;
                     = 'L':  Lower triangle of A is stored.

           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 COMPLEX*16 array, dimension (N*(N+1)/2)
                     The triangular factor U or L from the Cholesky factorization
                     A = U**H * U or A = L * L**H, packed columnwise in a linear
                     array.  The j-th column of U or L is stored in the array AP
                     as follows:
                     if UPLO = 'U', AP(i + (j-1)*j/2) = U(i,j) for 1<=i<=j;
                     if UPLO = 'L', AP(i + (j-1)*(2n-j)/2) = L(i,j) for j<=i<=n.

           B

                     B is COMPLEX*16 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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