zhetrs_aa_2stage.f - Man Page

subroutine zhetrs_aa_2stage (uplo, n, nrhs, a, lda, tb, ltb, ipiv, ipiv2, b, ldb, info)
ZHETRS_AA_2STAGE

ZHETRS_AA_2STAGE  

Purpose:

 ZHETRS_AA_2STAGE solves a system of linear equations A*X = B with a 
 hermitian matrix A using the factorization A = U**H*T*U or
 A = L*T*L**H computed by ZHETRF_AA_2STAGE.

Parameters

UPLO

          UPLO is 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**H*T*U;
          = 'L':  Lower triangular, form is A = L*T*L**H.

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.

A

          A is COMPLEX*16 array, dimension (LDA,N)
          Details of factors computed by ZHETRF_AA_2STAGE.

LDA

          LDA is INTEGER
          The leading dimension of the array A.  LDA >= max(1,N).

TB

          TB is COMPLEX*16 array, dimension (LTB)
          Details of factors computed by ZHETRF_AA_2STAGE.

LTB

          LTB is INTEGER
          The size of the array TB. LTB >= 4*N.

IPIV

          IPIV is INTEGER array, dimension (N)
          Details of the interchanges as computed by
          ZHETRF_AA_2STAGE.

IPIV2

          IPIV2 is INTEGER array, dimension (N)
          Details of the interchanges as computed by
          ZHETRF_AA_2STAGE.

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 139 of file zhetrs_aa_2stage.f.