# zhetrs_aa_2stage.f - Man Page

## Synopsis

### Functions/Subroutines

subroutine zhetrs_aa_2stage (UPLO, N, NRHS, A, LDA, TB, LTB, IPIV, IPIV2, B, LDB, INFO)
ZHETRS_AA_2STAGE

## Function/Subroutine Documentation

### subroutine zhetrs_aa_2stage (character UPLO, integer N, integer NRHS, complex*16, dimension( lda, * ) A, integer LDA, complex*16, dimension( * ) TB, integer LTB, integer, dimension( * ) IPIV, integer, dimension( * ) IPIV2, complex*16, dimension( ldb, * ) B, integer LDB, integer INFO)

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*T*U**T or
A = L*T*L**T 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*T*U**T;
= 'L':  Lower triangular, form is A = L*T*L**T.```

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*16array, 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*16array, dimension (LTB)
Details of factors computed by ZHETRF_AA_2STAGE.```

LTB

`          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*16array, 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 2017

Definition at line 142 of file zhetrs_aa_2stage.f.

## Author

Generated automatically by Doxygen for LAPACK from the source code.

## Referenced By

The man page zhetrs_aa_2stage(3) is an alias of zhetrs_aa_2stage.f(3).

Tue Nov 14 2017 Version 3.8.0 LAPACK