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/* -*- mode: C -*- */
/*
IGraph library.
Copyright (C) 2008-2012 Gabor Csardi <csardi.gabor@gmail.com>
334 Harvard street, Cambridge, MA 02139 USA
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 2 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, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA
*/
#ifndef IGRAPH_MATH_H
#define IGRAPH_MATH_H
#include "config.h"
#include <math.h>
#include <stddef.h>
#undef __BEGIN_DECLS
#undef __END_DECLS
#ifdef __cplusplus
# define __BEGIN_DECLS extern "C" {
# define __END_DECLS }
#else
# define __BEGIN_DECLS /* empty */
# define __END_DECLS /* empty */
#endif
__BEGIN_DECLS
/**
* \def IGRAPH_SHORTEST_PATH_EPSILON
*
* Relative error threshold used in weighted shortest path calculations
* to decide whether two shortest paths are of equal length.
*/
#define IGRAPH_SHORTEST_PATH_EPSILON 1e-10
/*
* Compiler-related hacks, mostly because of Microsoft Visual C++
*/
double igraph_i_round(double X);
int igraph_i_snprintf(char *buffer, size_t count, const char *format, ...);
double igraph_log2(const double a);
double igraph_log1p(double a);
long double igraph_fabsl(long double a);
double igraph_fmin(double a, double b);
#ifndef HAVE_LOG2
#define log2(a) igraph_log2(a)
#endif
#ifndef HAVE_LOG1P
#define log1p(a) igraph_log1p(a)
#endif
#ifndef HAVE_FABSL
#define fabsl(a) igraph_fabsl(a)
#endif
#ifndef HAVE_FMIN
#define fmin(a,b) igraph_fmin((a),(b))
#endif
#ifndef HAVE_ROUND
#define round igraph_i_round
#endif
#ifndef M_PI
# define M_PI 3.14159265358979323846
#endif
#ifndef M_PI_2
# define M_PI_2 1.57079632679489661923
#endif
#ifndef M_LN2
# define M_LN2 0.69314718055994530942
#endif
#ifndef M_SQRT2
# define M_SQRT2 1.4142135623730950488016887
#endif
#ifndef M_LN_SQRT_2PI
#define M_LN_SQRT_2PI 0.918938533204672741780329736406 /* log(sqrt(2*pi))
== log(2*pi)/2 */
#endif
int igraph_almost_equals(double a, double b, double eps);
int igraph_cmp_epsilon(double a, double b, double eps);
__END_DECLS
#endif
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