Provided by: liblapack-doc_3.3.1-1_all NAME

LAPACK-3  -  CLA_HERCOND_X  compute the infinity norm condition number of  op(A) * diag(X)
where X is a COMPLEX vector

SYNOPSIS

REAL FUNCTION CLA_HERCOND_X( UPLO, N, A, LDA, AF, LDAF, IPIV, X, INFO, WORK, RWORK )

IMPLICIT  NONE

CHARACTER UPLO

INTEGER   N, LDA, LDAF, INFO

INTEGER   IPIV( * )

COMPLEX   A( LDA, * ), AF( LDAF, * ), WORK( * ), X( * )

REAL      RWORK( * )

PURPOSE

CLA_HERCOND_X computes the infinity norm condition number of
op(A) * diag(X) where X is a COMPLEX vector.

ARGUMENTS

UPLO    (input) CHARACTER*1
= 'U':  Upper triangle of A is stored;
= 'L':  Lower triangle of A is stored.

N       (input) INTEGER
The number of linear equations, i.e., the order of the
matrix A.  N >= 0.

A       (input) COMPLEX array, dimension (LDA,N)
On entry, the N-by-N matrix A.

LDA     (input) INTEGER
The leading dimension of the array A.  LDA >= max(1,N).

AF      (input) COMPLEX array, dimension (LDAF,N)
The block diagonal matrix D and the multipliers used to
obtain the factor U or L as computed by CHETRF.

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

IPIV    (input) INTEGER array, dimension (N)
Details of the interchanges and the block structure of D
as determined by CHETRF.

X       (input) COMPLEX array, dimension (N)
The vector X in the formula op(A) * diag(X).

INFO    (output) INTEGER
= 0:  Successful exit.
i > 0:  The ith argument is invalid.

WORK    (input) COMPLEX array, dimension (2*N).
Workspace.

RWORK   (input) REAL array, dimension (N).
Workspace.

LAPACK routine (version 3.2.1)          April 2011                     CLA_HERCOND_X(3lapack)