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cla_syrcond_x.f(3) LAPACK cla_syrcond_x.f(3)

NAME

cla_syrcond_x.f -

SYNOPSIS

Functions/Subroutines


real function cla_syrcond_x (UPLO, N, A, LDA, AF, LDAF, IPIV, X, INFO, WORK, RWORK)
 
CLA_SYRCOND_X computes the infinity norm condition number of op(A)*diag(x) for symmetric indefinite matrices.

Function/Subroutine Documentation

real function cla_syrcond_x (characterUPLO, integerN, complex, dimension( lda, * )A, integerLDA, complex, dimension( ldaf, * )AF, integerLDAF, integer, dimension( * )IPIV, complex, dimension( * )X, integerINFO, complex, dimension( * )WORK, real, dimension( * )RWORK)

CLA_SYRCOND_X computes the infinity norm condition number of op(A)*diag(x) for symmetric indefinite matrices.
Purpose: 
    CLA_SYRCOND_X Computes the infinity norm condition number of
    op(A) * diag(X) where X is a COMPLEX 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 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 block diagonal matrix D and the multipliers used to
     obtain the factor U or L as computed by CSYTRF.
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 CSYTRF.
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:
September 2012
Definition at line 131 of file cla_syrcond_x.f.

Author

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