
dla_porcond.f(3) LAPACK dla_porcond.f(3)
NAME
dla_porcond.f 
SYNOPSIS
Functions/Subroutines
DOUBLE PRECISION function dla_porcond (UPLO, N, A, LDA, AF, LDAF, CMODE, C, INFO, WORK,
IWORK)
DLA_PORCOND estimates the Skeel condition number for a symmetric positivedefinite
matrix.
Function/Subroutine Documentation
DOUBLE PRECISION function dla_porcond (characterUPLO, integerN, double precision, dimension(
lda, * )A, integerLDA, double precision, dimension( ldaf, * )AF, integerLDAF,
integerCMODE, double precision, dimension( * )C, integerINFO, double precision, dimension(
* )WORK, integer, dimension( * )IWORK)
DLA_PORCOND estimates the Skeel condition number for a symmetric positivedefinite matrix.
Purpose:
DLA_PORCOND Estimates the Skeel condition number of op(A) * op2(C)
where op2 is determined by CMODE as follows
CMODE = 1 op2(C) = C
CMODE = 0 op2(C) = I
CMODE = 1 op2(C) = inv(C)
The Skeel condition number cond(A) = norminf( inv(A)A )
is computed by computing scaling factors R such that
diag(R)*A*op2(C) is row equilibrated and computing the standard
infinitynorm condition number.
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 DOUBLE PRECISION array, dimension (LDA,N)
On entry, the NbyN matrix A.
LDA
LDA is INTEGER
The leading dimension of the array A. LDA >= max(1,N).
AF
AF is DOUBLE PRECISION array, dimension (LDAF,N)
The triangular factor U or L from the Cholesky factorization
A = U**T*U or A = L*L**T, as computed by DPOTRF.
LDAF
LDAF is INTEGER
The leading dimension of the array AF. LDAF >= max(1,N).
CMODE
CMODE is INTEGER
Determines op2(C) in the formula op(A) * op2(C) as follows:
CMODE = 1 op2(C) = C
CMODE = 0 op2(C) = I
CMODE = 1 op2(C) = inv(C)
C
C is DOUBLE PRECISION array, dimension (N)
The vector C in the formula op(A) * op2(C).
INFO
INFO is INTEGER
= 0: Successful exit.
i > 0: The ith argument is invalid.
WORK
WORK is DOUBLE PRECISION array, dimension (3*N).
Workspace.
IWORK
IWORK is INTEGER array, dimension (N).
Workspace.
Author:
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Date:
September 2012
Definition at line 141 of file dla_porcond.f.
Author
Generated automatically by Doxygen for LAPACK from the source code.
Version 3.4.2 Tue Sep 25 2012 dla_porcond.f(3) 
