# cla_syrcond_x.f man page

cla_syrcond_x.f

## Synopsis

### Functions/Subroutines

real function **cla_syrcond_x** (UPLO, **N**, A, **LDA**, AF, LDAF, IPIV, X, INFO, WORK, RWORK)**CLA_SYRCOND_X** computes the infinity norm condition number of op(A)*diag(x) for symmetric indefinite matrices.

## Function/Subroutine Documentation

### real function cla_syrcond_x (character UPLO, integer N, complex, dimension( lda, * ) A, integer LDA, complex, dimension( ldaf, * ) AF, integer LDAF, integer, dimension( * ) IPIV, complex, dimension( * ) X, integer INFO, complex, dimension( * ) WORK, real, dimension( * ) RWORK)

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

**Purpose:**

CLA_SYRCOND_X Computes the infinity norm condition number of op(A) * diag(X) where X is a COMPLEX 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 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 array, dimension (LDAF,N) The block diagonal matrix D and the multipliers used to obtain the factor U or L as computed by CSYTRF.

*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 CSYTRF.

*X*X is COMPLEX 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 array, dimension (2*N). Workspace.

*RWORK*RWORK is REAL array, dimension (N). Workspace.

**Author:**-
Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

**Date:**December 2016

Definition at line 133 of file cla_syrcond_x.f.

## Author

Generated automatically by Doxygen for LAPACK from the source code.

## Referenced By

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

Tue Nov 14 2017 Version 3.8.0 LAPACK