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  4. zla_porcond_x(3)

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zla_porcond_x.f(3) LAPACK zla_porcond_x.f(3)

NAME

zla_porcond_x.f

SYNOPSIS

Functions/Subroutines


double precision function zla_porcond_x (UPLO, N, A, LDA, AF, LDAF, X, INFO, WORK, RWORK)
ZLA_PORCOND_X computes the infinity norm condition number of op(A)*diag(x) for Hermitian positive-definite matrices.

Function/Subroutine Documentation

double precision function zla_porcond_x (character UPLO, integer N, complex*16, dimension( lda, * ) A, integer LDA, complex*16, dimension( ldaf, * ) AF, integer LDAF, complex*16, dimension( * ) X, integer INFO, complex*16, dimension( * ) WORK, double precision, dimension( * ) RWORK)

ZLA_PORCOND_X computes the infinity norm condition number of op(A)*diag(x) for Hermitian positive-definite matrices.

Purpose: 



    ZLA_PORCOND_X Computes the infinity norm condition number of


    op(A) * diag(X) where X is a COMPLEX*16 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 triangular factor U or L from the Cholesky factorization


     A = U**H*U or A = L*L**H, as computed by ZPOTRF.

LDAF



          LDAF is INTEGER


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

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:

December 2016

Definition at line 127 of file zla_porcond_x.f.

Author

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