1 /** @file series_expansion.cpp
3 * Series expansion test (Laurent and Taylor series). */
6 * GiNaC Copyright (C) 1999 Johannes Gutenberg University Mainz, Germany
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 #include <ginac/ginac.h>
24 using namespace GiNaC;
28 static unsigned check_series(const ex &e, const ex &point, const ex &d)
30 ex es = e.series(x, point, 8);
31 ex ep = static_cast<series *>(es.bp)->convert_to_poly();
32 if ((ep - d).compare(exZERO()) != 0) {
33 clog << "series expansion of " << e << " at " << point
34 << " erroneously returned " << ep << " (instead of " << d
36 (ep-d).printtree(clog);
43 static unsigned series1(void)
49 d = x - pow(x, 3) / 6 + pow(x, 5) / 120 - pow(x, 7) / 5040 + Order(pow(x, 8));
50 result += check_series(e, exZERO(), d);
53 d = 1 - pow(x, 2) / 2 + pow(x, 4) / 24 - pow(x, 6) / 720 + Order(pow(x, 8));
54 result += check_series(e, exZERO(), d);
57 d = 1 + x + pow(x, 2) / 2 + pow(x, 3) / 6 + pow(x, 4) / 24 + pow(x, 5) / 120 + pow(x, 6) / 720 + pow(x, 7) / 5040 + Order(pow(x, 8));
58 result += check_series(e, exZERO(), d);
61 d = 1 + x + pow(x, 2) + pow(x, 3) + pow(x, 4) + pow(x, 5) + pow(x, 6) + pow(x, 7) + Order(pow(x, 8));
62 result += check_series(e, exZERO(), d);
66 result += check_series(e, exZERO(), d);
69 d = 2 + pow(x-1, 2) - pow(x-1, 3) + pow(x-1, 4) - pow(x-1, 5) + pow(x-1, 6) - pow(x-1, 7) + Order(pow(x-1, 8));
70 result += check_series(e, exONE(), d);
72 e = pow(x + pow(x, 3), -1);
73 d = pow(x, -1) - x + pow(x, 3) - pow(x, 5) + Order(pow(x, 7));
74 result += check_series(e, exZERO(), d);
76 e = pow(pow(x, 2) + pow(x, 4), -1);
77 d = pow(x, -2) - 1 + pow(x, 2) - pow(x, 4) + Order(pow(x, 6));
78 result += check_series(e, exZERO(), d);
81 d = pow(x, -2) + numeric(1,3) + pow(x, 2) / 15 + pow(x, 4) * 2/189 + Order(pow(x, 5));
82 result += check_series(e, exZERO(), d);
85 d = x + pow(x, 3) / 3 + pow(x, 5) * 2/15 + pow(x, 7) * 17/315 + Order(pow(x, 8));
86 result += check_series(e, exZERO(), d);
89 d = pow(x, -1) - x / 3 - pow(x, 3) / 45 - pow(x, 5) * 2/945 + Order(pow(x, 6));
90 result += check_series(e, exZERO(), d);
92 e = pow(numeric(2), x);
93 ex t = log(ex(2)) * x;
94 d = 1 + t + pow(t, 2) / 2 + pow(t, 3) / 6 + pow(t, 4) / 24 + pow(t, 5) / 120 + pow(t, 6) / 720 + pow(t, 7) / 5040 + Order(pow(x, 8));
95 result += check_series(e, exZERO(), d.expand());
99 d = 1 + t + pow(t, 2) / 2 + pow(t, 3) / 6 + pow(t, 4) / 24 + pow(t, 5) / 120 + pow(t, 6) / 720 + pow(t, 7) / 5040 + Order(pow(x, 8));
100 result += check_series(e, exZERO(), d.expand());
106 static unsigned series2(void)
111 e = pow(sin(x), -1).series(x, exZERO(), 8) + pow(sin(-x), -1).series(x, exZERO(), 12);
112 d = Order(pow(x, 6));
113 result += check_series(e, exZERO(), d);
118 // Series multiplication
119 static unsigned series3(void)
124 e = sin(x).series(x, exZERO(), 8) * pow(sin(x), -1).series(x, exZERO(), 12);
125 d = 1 + Order(pow(x, 7));
126 result += check_series(e, exZERO(), d);
131 unsigned series_expansion(void)
135 cout << "checking series expansion..." << flush;
136 clog << "---------series expansion:" << endl;
144 clog << "(no output)" << endl;