LA_library/miscfunc.h

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/*
LA: linear algebra C++ interface library
Copyright (C) 2024 Jiri Pittner <jiri.pittner@jh-inst.cas.cz> or <jiri@pittnerovi.com>
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 of the License, 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, see <http://www.gnu.org/licenses/>.
*/
#ifndef _MISCFUNC_H
#define _MISCFUNC_H
namespace LA {
const double c_euler= 0.5772156649015328606065120900824024310422;
extern unsigned long long factorial(const int n);
extern double factorialln(const int n);
extern unsigned long long binom(int n, int k);
extern unsigned long long longpow(unsigned long long x, int i);
extern double zeta(double x);
extern double gamma(double x);
extern double gammln(double x);
extern double bernoulli_number(int n);
extern unsigned long long simplicial(int d, int n); //simplicial numbers in a precomputed efficient way
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extern int inverse_simplicial(int d, unsigned long long s);
}//namespace
#endif