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zsytri2x.f -

# SYNOPSIS

## Functions/Subroutines

subroutine zsytri2x (UPLO, N, A, LDA, IPIV, WORK, NB, INFO)

ZSYTRI2X

# Function/Subroutine Documentation

## subroutine zsytri2x (characterUPLO, integerN, complex*16, dimension( lda, * )A, integerLDA, integer, dimension( * )IPIV, complex*16, dimension( n+nb+1,* )WORK, integerNB, integerINFO)

ZSYTRI2X
Purpose:
``` ZSYTRI2X computes the inverse of a complex symmetric indefinite matrix
A using the factorization A = U*D*U**T or A = L*D*L**T computed by
ZSYTRF.
```
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*D*U**T;
= 'L':  Lower triangular, form is A = L*D*L**T.
```
N
```          N is INTEGER
The order of the matrix A.  N >= 0.
```
A
```          A is COMPLEX*16 array, dimension (LDA,N)
On entry, the NNB diagonal matrix D and the multipliers
used to obtain the factor U or L as computed by ZSYTRF.

On exit, if INFO = 0, the (symmetric) inverse of the original
matrix.  If UPLO = 'U', the upper triangular part of the
inverse is formed and the part of A below the diagonal is not
referenced; if UPLO = 'L' the lower triangular part of the
inverse is formed and the part of A above the diagonal is
not referenced.
```
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 and the NNB structure of D
as determined by ZSYTRF.
```
WORK
```          WORK is COMPLEX*16 array, dimension (N+NNB+1,NNB+3)
```
NB
```          NB is INTEGER
Block size
```
INFO
```          INFO is INTEGER
= 0: successful exit
< 0: if INFO = -i, the i-th argument had an illegal value
> 0: if INFO = i, D(i,i) = 0; the matrix is singular and its
inverse could not be computed.
```
Author:
Univ. of Tennessee
Univ. of California Berkeley
NAG Ltd.
Date:
November 2011
Definition at line 121 of file zsytri2x.f.

# Author

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