# zla_syrcond_c.f man page

zla_syrcond_c.f

## Synopsis

### Functions/Subroutines

double precision function **zla_syrcond_c** (UPLO, **N**, A, **LDA**, AF, LDAF, IPIV, C, CAPPLY, INFO, WORK, RWORK)**ZLA_SYRCOND_C** computes the infinity norm condition number of op(A)*inv(diag(c)) for symmetric indefinite matrices.

## Function/Subroutine Documentation

### double precision function zla_syrcond_c (character UPLO, integer N, complex*16, dimension( lda, * ) A, integer LDA, complex*16, dimension( ldaf, * ) AF, integer LDAF, integer, dimension( * ) IPIV, double precision, dimension( * ) C, logical CAPPLY, integer INFO, 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:**December 2016

Definition at line 142 of file zla_syrcond_c.f.

## Author

Generated automatically by Doxygen for LAPACK from the source code.

## Referenced By

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

Tue Nov 14 2017 Version 3.8.0 LAPACK