NAME

SRC/zla_gerpvgrw.f

SYNOPSIS

Functions/Subroutines

double precision function zla_gerpvgrw (n, ncols, a, lda, af, ldaf)
ZLA_GERPVGRW multiplies a square real matrix by a complex matrix.

Function/Subroutine Documentation

double precision function zla_gerpvgrw (integer n, integer ncols, complex16, dimension( lda, ) a, integer lda, complex16, dimension( ldaf, ) af, integer ldaf)

ZLA_GERPVGRW multiplies a square real matrix by a complex matrix.

Purpose:



 ZLA_GERPVGRW computes the reciprocal pivot growth factor


 norm(A)/norm(U). The 'max absolute element' norm is used. If this is


 much less than 1, the stability of the LU factorization of the


 (equilibrated) matrix A could be poor. This also means that the


 solution X, estimated condition numbers, and error bounds could be


 unreliable.

Parameters



          N is INTEGER


     The number of linear equations, i.e., the order of the


     matrix A.  N >= 0.

NCOLS



          NCOLS is INTEGER


     The number of columns of the matrix A. NCOLS >= 0.



          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 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).

Author

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Definition at line 98 of file zla_gerpvgrw.f.

Author