ZHPTRS (3lapack)

solve a system of linear equations A*X = B with a complex Hermitian matrix A stored in packed format using the factorization A = U*D*U**H or A = L*D*L**H computed by ZHPTRF

SYNOPSIS

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

      CHARACTER      UPLO

      INTEGER        INFO, LDB, N, NRHS

      INTEGER        IPIV( * )

      COMPLEX*16     AP( * ), B( LDB, * )

PURPOSE

  ZHPTRS solves a system of linear equations A*X = B with a complex Hermitian
  matrix A stored in packed format using the factorization A = U*D*U**H or A
  = L*D*L**H computed by ZHPTRF.

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**H;
          = 'L':  Lower triangular, form is A = L*D*L**H.

  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*16 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 ZHPTRF, 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 ZHPTRF.

  B       (input/output) COMPLEX*16 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