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zla_syrcond_x.f(3) | LAPACK | zla_syrcond_x.f(3) |
NAME¶
zla_syrcond_x.f -SYNOPSIS¶
Functions/Subroutines¶
double precision function zla_syrcond_x (UPLO, N, A, LDA, AF, LDAF, IPIV, X, INFO, WORK, RWORK)
Function/Subroutine Documentation¶
double precision function zla_syrcond_x (characterUPLO, integerN, complex*16, dimension( lda, * )A, integerLDA, complex*16, dimension( ldaf, * )AF, integerLDAF, integer, dimension( * )IPIV, complex*16, dimension( * )X, integerINFO, 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.
UPLO
Author:
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.
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Date:
September 2012
Definition at line 132 of file zla_syrcond_x.f.
Author¶
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