SRC/zla_gercond_x.f(3) | Library Functions Manual | SRC/zla_gercond_x.f(3) |
NAME
SRC/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 (character trans, integer n, complex*16, dimension( lda, * ) a, integer lda, complex*16, dimension( ldaf, * ) af, integer ldaf, integer, dimension( * ) ipiv, complex*16, dimension( * ) x, integer info, 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.
Definition at line 133 of file zla_gercond_x.f.
Author
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