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cla_gercond_x.f(3) LAPACK cla_gercond_x.f(3)

NAME

cla_gercond_x.f

SYNOPSIS

Functions/Subroutines


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

Function/Subroutine Documentation

real function cla_gercond_x (character TRANS, 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_GERCOND_X computes the infinity norm condition number of op(A)*diag(x) for general matrices.

Purpose: 



    CLA_GERCOND_X computes the infinity norm condition number of


    op(A) * diag(X) where X is a COMPLEX 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 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 factors L and U from the factorization


     A = P*L*U as computed by CGETRF.

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 CGETRF; row i of the matrix was interchanged


     with row IPIV(i).

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 137 of file cla_gercond_x.f.

Author

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