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  4. ZLA_GERCOND_X(3)

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zla_gercond_x.f(3) LAPACK zla_gercond_x.f(3)

NAME

zla_gercond_x.f -

SYNOPSIS

Functions/Subroutines


DOUBLE PRECISION function zla_gercond_x (TRANS, N, A, LDA, AF, LDAF, IPIV, X, INFO, WORK, RWORK)
ZLA_GERCOND_X computes the infinity norm condition number of op(A)*diag(x) for general matrices.

Function/Subroutine Documentation

DOUBLE PRECISION function zla_gercond_x (characterTRANS, integerN, complex*16, dimension( lda, * )A, integerLDA, complex*16, dimension( ldaf, * )AF, integerLDAF, integer, dimension( * )IPIV, complex*16, dimension( * )X, integerINFO, complex*16, dimension( * )WORK, double precision, dimension( * )RWORK)

ZLA_GERCOND_X computes the infinity norm condition number of op(A)*diag(x) for general matrices.

Purpose: 



    ZLA_GERCOND_X computes the infinity norm condition number of


    op(A) * diag(X) where X is a COMPLEX*16 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).

X



          X is COMPLEX*16 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*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 135 of file zla_gercond_x.f.

Author

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Tue Sep 25 2012 Version 3.4.2