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 zla_syrcond_x.f(3) LAPACK zla_syrcond_x.f(3)

NAME

zla_syrcond_x.f -

SYNOPSIS

Functions/Subroutines

DOUBLE PRECISION function zla_syrcond_x (UPLO, N, A, LDA, AF, LDAF, IPIV, X, INFO, WORK, RWORK)

ZLA_SYRCOND_X computes the infinity norm condition number of op(A)*diag(x) for symmetric indefinite matrices.

Function/Subroutine Documentation

DOUBLE PRECISION function zla_syrcond_x (characterUPLO, integerN, complex*16, dimension( lda, * )A, integerLDA, complex*16, dimension( ldaf, * )AF, integerLDAF, integer, dimension( * )IPIV, complex*16, dimension( * )X, integerINFO, complex*16, dimension( * )WORK, double precision, dimension( * )RWORK)

ZLA_SYRCOND_X computes the infinity norm condition number of op(A)*diag(x) for symmetric indefinite matrices.
Purpose:
```    ZLA_SYRCOND_X Computes the infinity norm condition number of
op(A) * diag(X) where X is a COMPLEX*16 vector.
```
Parameters:
UPLO
```          UPLO is CHARACTER*1
= 'U':  Upper triangle of A is stored;
= 'L':  Lower triangle of A is stored.
```
N
```          N is INTEGER
The number of linear equations, i.e., the order of the
matrix A.  N >= 0.
```
A
```          A is COMPLEX*16 array, dimension (LDA,N)
On entry, the N-by-N matrix A.
```
LDA
```          LDA is INTEGER
The leading dimension of the array A.  LDA >= max(1,N).
```
AF
```          AF is COMPLEX*16 array, dimension (LDAF,N)
The block diagonal matrix D and the multipliers used to
obtain the factor U or L as computed by ZSYTRF.
```
LDAF
```          LDAF is INTEGER
The leading dimension of the array AF.  LDAF >= max(1,N).
```
IPIV
```          IPIV is INTEGER array, dimension (N)
Details of the interchanges and the block structure of D
as determined by ZSYTRF.
```
X
```          X is COMPLEX*16 array, dimension (N)
The vector X in the formula op(A) * diag(X).
```
INFO
```          INFO is INTEGER
= 0:  Successful exit.
i > 0:  The ith argument is invalid.
```
WORK
```          WORK is COMPLEX*16 array, dimension (2*N).
Workspace.
```
RWORK
```          RWORK is DOUBLE PRECISION array, dimension (N).
Workspace.
```
Author:
Univ. of Tennessee
Univ. of California Berkeley
NAG Ltd.
Date:
September 2012
Definition at line 132 of file zla_syrcond_x.f.

Author

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 Sat Nov 16 2013 Version 3.4.2

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