|
kusano |
7d535a |
|
|
kusano |
7d535a |
<meta content="text/html;charset=UTF-8" http-equiv="Content-Type">
|
|
kusano |
7d535a |
<title>SuperLU: SRC/dlacon.c File Reference</title>
|
|
kusano |
7d535a |
<link href="doxygen.css" rel="stylesheet" type="text/css">
|
|
kusano |
7d535a |
<link href="tabs.css" rel="stylesheet" type="text/css">
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
Main Page
|
|
kusano |
7d535a |
Data Structures
|
|
kusano |
7d535a |
Files
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
SRC/dlacon.c File ReferenceEstimates the 1-norm. More...
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
#include <math.h>
|
|
kusano |
7d535a |
#include "slu_Cnames.h"
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
Defines
|
|
kusano |
7d535a |
#define d_sign(a, b) (b >= 0 ? fabs(a) : -fabs(a))
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
#define i_dnnt(a) ( a>=0 ? floor(a+.5) : -floor(.5-a) )
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
Functions
|
|
kusano |
7d535a |
int dlacon_ (int *n, double *v, double *x, int *isgn, double *est, int *kase)
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
Detailed Description
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
-- SuperLU routine (version 2.0) --
|
|
kusano |
7d535a |
Univ. of California Berkeley, Xerox Palo Alto Research Center,
|
|
kusano |
7d535a |
and Lawrence Berkeley National Lab.
|
|
kusano |
7d535a |
November 15, 1997
|
|
kusano |
7d535a |
Define Documentation
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
#define d_sign
|
|
kusano |
7d535a |
(
|
|
kusano |
7d535a |
a,
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
b
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
)
|
|
kusano |
7d535a |
(b >= 0 ? fabs(a) : -fabs(a))
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
#define i_dnnt
|
|
kusano |
7d535a |
(
|
|
kusano |
7d535a |
a
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
)
|
|
kusano |
7d535a |
( a>=0 ? floor(a+.5) : -floor(.5-a) )
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
Function Documentation
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
int dlacon_
|
|
kusano |
7d535a |
(
|
|
kusano |
7d535a |
int *
|
|
kusano |
7d535a |
n,
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
double *
|
|
kusano |
7d535a |
v,
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
double *
|
|
kusano |
7d535a |
x,
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
int *
|
|
kusano |
7d535a |
isgn,
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
double *
|
|
kusano |
7d535a |
est,
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
int *
|
|
kusano |
7d535a |
kase
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
)
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
Purpose
|
|
kusano |
7d535a |
=======
|
|
kusano |
7d535a |
DLACON estimates the 1-norm of a square matrix A.
|
|
kusano |
7d535a |
Reverse communication is used for evaluating matrix-vector products.
|
|
kusano |
7d535a |
Arguments
|
|
kusano |
7d535a |
=========
|
|
kusano |
7d535a |
N (input) INT
|
|
kusano |
7d535a |
The order of the matrix. N >= 1.
|
|
kusano |
7d535a |
V (workspace) DOUBLE PRECISION array, dimension (N)
|
|
kusano |
7d535a |
On the final return, V = A*W, where EST = norm(V)/norm(W)
|
|
kusano |
7d535a |
(W is not returned).
|
|
kusano |
7d535a |
X (input/output) DOUBLE PRECISION array, dimension (N)
|
|
kusano |
7d535a |
On an intermediate return, X should be overwritten by
|
|
kusano |
7d535a |
A * X, if KASE=1,
|
|
kusano |
7d535a |
A' * X, if KASE=2,
|
|
kusano |
7d535a |
and DLACON must be re-called with all the other parameters
|
|
kusano |
7d535a |
unchanged.
|
|
kusano |
7d535a |
ISGN (workspace) INT array, dimension (N)
|
|
kusano |
7d535a |
EST (output) DOUBLE PRECISION
|
|
kusano |
7d535a |
An estimate (a lower bound) for norm(A).
|
|
kusano |
7d535a |
KASE (input/output) INT
|
|
kusano |
7d535a |
On the initial call to DLACON, KASE should be 0.
|
|
kusano |
7d535a |
On an intermediate return, KASE will be 1 or 2, indicating
|
|
kusano |
7d535a |
whether X should be overwritten by A * X or A' * X.
|
|
kusano |
7d535a |
On the final return from DLACON, KASE will again be 0.
|
|
kusano |
7d535a |
Further Details
|
|
kusano |
7d535a |
======= =======
|
|
kusano |
7d535a |
Contributed by Nick Higham, University of Manchester.
|
|
kusano |
7d535a |
Originally named CONEST, dated March 16, 1988.
|
|
kusano |
7d535a |
Reference: N.J. Higham, "FORTRAN codes for estimating the one-norm of
|
|
kusano |
7d535a |
a real or complex matrix, with applications to condition estimation",
|
|
kusano |
7d535a |
ACM Trans. Math. Soft., vol. 14, no. 4, pp. 381-396, December 1988.
|
|
kusano |
7d535a |
=====================================================================
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
<address style="text-align: right;"><small>Generated on Mon Nov 22 10:23:47 2010 for SuperLU by </small></address>
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
 1.5.5
|
|
kusano |
7d535a |
|
|
kusano |
7d535a |
|