SRC/zpptrs.f(3)

NAME
SRC/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.

Definition at line 107 of file zpptrs.f.

Author

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