# zla_syrcond_c.f man page

zla_syrcond_c.f —

## Synopsis

### Functions/Subroutines

DOUBLE PRECISION functionzla_syrcond_c(UPLO, N, A, LDA, AF, LDAF, IPIV, C, CAPPLY, INFO, WORK, RWORK)ZLA_SYRCOND_Ccomputes the infinity norm condition number of op(A)*inv(diag(c)) for symmetric indefinite matrices.

## Function/Subroutine Documentation

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

**ZLA_SYRCOND_C** computes the infinity norm condition number of op(A)*inv(diag(c)) for symmetric indefinite matrices.

**Purpose:**

```
ZLA_SYRCOND_C Computes the infinity norm condition number of
op(A) * inv(diag(C)) where C is a DOUBLE PRECISION 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.
```

*C*

```
C is DOUBLE PRECISION array, dimension (N)
The vector C in the formula op(A) * inv(diag(C)).
```

*CAPPLY*

```
CAPPLY is LOGICAL
If .TRUE. then access the vector C in the formula above.
```

*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

Univ. of Colorado Denver

NAG Ltd.

**Date:**

September 2012

Definition at line 139 of file zla_syrcond_c.f.

## Author

Generated automatically by Doxygen for LAPACK from the source code.

## Referenced By

zla_syrcond_c(3) is an alias of zla_syrcond_c.f(3).