1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
|
/*$Id: l_denoise.h,v 26.81 2008/05/27 05:34:00 al Exp $ -*- C++ -*-
* Copyright (C) 2001 Albert Davis
* Author: Albert Davis <aldavis@gnu.org>
*
* This file is part of "Gnucap", the Gnu Circuit Analysis Package
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*------------------------------------------------------------------
* functions to "de-noise" arithmetic
* attempt to get rid of noise due to roundoff
*/
//testing=script,complete 2006.07.13
#ifndef L_DENOISE_H
#define L_DENOISE_H
#include "u_opt.h"
/*--------------------------------------------------------------------------*/
/* fixzero: force numbers near zero to zero - changes thru pointer */
inline void fixzero(double *z, double r)
{
assert(z);
assert(*z == *z);
assert(r == r);
if (std::abs(*z) < std::abs(r*OPT::roundofftol)) {
*z=0.;
}
}
/*--------------------------------------------------------------------------*/
/* fixzero: force numbers near zero to zero - returns value */
inline double fixzero(double z, double r)
{
assert(z == z);
assert(r == r);
return (std::abs(z) < std::abs(r*OPT::roundofftol)) ? 0. : z;
}
/*--------------------------------------------------------------------------*/
/* dn_diff: de-noised difference */
inline double dn_diff(double a, double b)
{
assert(a == a);
assert(b == b);
return fixzero(a-b, a);
}
/*--------------------------------------------------------------------------*/
#if 0
/* dn_sum: de-noised sum */
inline double dn_sum(double a, double b)
{
untested();
assert(a == a);
assert(b == b);
return fixzero(a+b, a);
}
#endif
/*--------------------------------------------------------------------------*/
/*--------------------------------------------------------------------------*/
#endif
// vim:ts=8:sw=2:noet:
|
