SRC/zhetrs_aa.f(3) Library Functions Manual SRC/zhetrs_aa.f(3)

SRC/zhetrs_aa.f


subroutine zhetrs_aa (uplo, n, nrhs, a, lda, ipiv, b, ldb, work, lwork, info)
ZHETRS_AA

ZHETRS_AA

Purpose:

!>
!> ZHETRS_AA solves a system of linear equations A*X = B with a complex
!> hermitian matrix A using the factorization A = U**H*T*U or
!> A = L*T*L**H computed by ZHETRF_AA.
!> 

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.
!> 

LDA

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

IPIV

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

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).
!> 

WORK

!>          WORK is COMPLEX*16 array, dimension (MAX(1,LWORK))
!> 

LWORK

!>          LWORK is INTEGER
!>          The dimension of the array WORK.
!>          If MIN(N,NRHS) = 0, LWORK >= 1, else LWORK >= 3*N-2.
!>
!>          If LWORK = -1, then a workspace query is assumed; the routine
!>          only calculates the minimal size of the WORK array, returns
!>          this value as the first entry of the WORK array, and no error
!>          message related to LWORK is issued by XERBLA.
!> 

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 136 of file zhetrs_aa.f.

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Version 3.12.0 LAPACK