# zla_gercond_c.f man page

zla_gercond_c.f —

## Synopsis

### Functions/Subroutines

DOUBLE PRECISION functionzla_gercond_c(TRANS, N, A, LDA, AF, LDAF, IPIV, C, CAPPLY, INFO, WORK, RWORK)ZLA_GERCOND_Ccomputes the infinity norm condition number of op(A)*inv(diag(c)) for general matrices.

## Function/Subroutine Documentation

### DOUBLE PRECISION function zla_gercond_c (characterTRANS, 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_GERCOND_C** computes the infinity norm condition number of op(A)*inv(diag(c)) for general matrices.

**Purpose:**

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

**Parameters:**

*TRANS*

```
TRANS is CHARACTER*1
Specifies the form of the system of equations:
= 'N': A * X = B (No transpose)
= 'T': A**T * X = B (Transpose)
= 'C': A**H * X = B (Conjugate Transpose = Transpose)
```

*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 factors L and U from the factorization
A = P*L*U as computed by ZGETRF.
```

*LDAF*

```
LDAF is INTEGER
The leading dimension of the array AF. LDAF >= max(1,N).
```

*IPIV*

```
IPIV is INTEGER array, dimension (N)
The pivot indices from the factorization A = P*L*U
as computed by ZGETRF; row i of the matrix was interchanged
with row IPIV(i).
```

*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 142 of file zla_gercond_c.f.

## Author

Generated automatically by Doxygen for LAPACK from the source code.

## Referenced By

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