3 * Copyright (C) 2008 Tomas 'ZeXx86' Jedrzejek (zexx86@zexos.org)
4 * Copyright (C) 2009 Tomas 'ZeXx86' Jedrzejek (zexx86@zexos.org)
6 * This program is free software: you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation, either version 3 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
26 static double fact (double x
)
31 return x
* fact (x
- 1.0);
34 static double expo (double x
, int a
)
41 for (i
= 0 ; i
< abs (a
); i
++)
44 return (a
> 0 ? ret
: 1 / ret
);
60 for (i
= 0 ; i
< 16; i
++)
61 ret
+= (expo (-1, i
) * expo (x
, 2 * i
)) / fact (2 * i
);