SRC/zla_syrcond_x.f(3) | Library Functions Manual | SRC/zla_syrcond_x.f(3) |
NAME
SRC/zla_syrcond_x.f
SYNOPSIS
Functions/Subroutines
double precision function zla_syrcond_x (uplo, n, a, lda,
af, ldaf, ipiv, x, info, work, rwork)
ZLA_SYRCOND_X computes the infinity norm condition number of
op(A)*diag(x) for symmetric indefinite matrices.
Function/Subroutine Documentation
double precision function zla_syrcond_x (character uplo, 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_SYRCOND_X computes the infinity norm condition number of op(A)*diag(x) for symmetric indefinite matrices.
Purpose:
ZLA_SYRCOND_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 block diagonal matrix D and the multipliers used to obtain the factor U or L as computed by ZSYTRF.
LDAF
LDAF is INTEGER The leading dimension of the array AF. LDAF >= max(1,N).
IPIV
IPIV is INTEGER array, dimension (N) Details of the interchanges and the block structure of D as determined by ZSYTRF.
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 130 of file zla_syrcond_x.f.
Author
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