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
|
/*************************************************************************
* Copyright (C) 2010-2011 Tavian Barnes <tavianator@tavianator.com> *
* *
* This file is part of The Dimension Test Suite. *
* *
* The Dimension Test Suite 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 of the *
* License, or (at your option) any later version. *
* *
* The Dimension Test Suite 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, see <http://www.gnu.org/licenses/>. *
*************************************************************************/
/*
* Basic test of numerical polynomial root-finder
*/
#include "dimension.h"
#include <stddef.h>
#include <stdio.h>
int
main(void)
{
/* Treat warnings as errors for tests */
dmnsn_die_on_warnings(true);
double poly[6], x[5];
/* poly[] = 2*(x + 1)*(x - 1.2345)*(x - 2.3456)*(x - 5)*(x - 100) */
poly[5] = 2.0;
poly[4] = -215.1602;
poly[3] = 1540.4520864;
poly[2] = -2430.5727856;
poly[1] = -1292.541872;
poly[0] = 2895.6432;
size_t n = dmnsn_polynomial_solve(poly, 5, x);
if (n != 4) {
fprintf(stderr,
"--- Wrong number of roots found (%zu, should be %u) ---\n",
n, 4);
return EXIT_FAILURE;
}
for (size_t i = 0; i < n; ++i) {
double evmin = dmnsn_polynomial_evaluate(poly, 5, x[i] - dmnsn_epsilon);
double ev = dmnsn_polynomial_evaluate(poly, 5, x[i]);
double evmax = dmnsn_polynomial_evaluate(poly, 5, x[i] + dmnsn_epsilon);
if (fabs(evmin) < fabs(ev) || fabs(evmax) < fabs(ev)) {
fprintf(stderr, "--- Root %.15g is inaccurate! ---\n", x[i]);
return EXIT_FAILURE;
}
}
return EXIT_SUCCESS;
}
|
