Abdelrahman Said
133 lines
4.8 KiB
C
133 lines
4.8 KiB
C
/* plfit.h
|
|
*
|
|
* Copyright (C) 2010-2011 Tamas Nepusz
|
|
*
|
|
* 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 PLFIT_H
|
|
#define PLFIT_H
|
|
|
|
#include <stdlib.h>
|
|
#include "plfit_decls.h"
|
|
#include "plfit_error.h"
|
|
#include "plfit_mt.h"
|
|
#include "plfit_sampling.h"
|
|
#include "plfit_version.h"
|
|
|
|
PLFIT_BEGIN_C_DECLS
|
|
|
|
typedef unsigned short int plfit_bool_t;
|
|
|
|
typedef enum {
|
|
PLFIT_LINEAR_ONLY,
|
|
PLFIT_STRATIFIED_SAMPLING,
|
|
PLFIT_GSS_OR_LINEAR,
|
|
PLFIT_DEFAULT_CONTINUOUS_METHOD = PLFIT_STRATIFIED_SAMPLING
|
|
} plfit_continuous_method_t;
|
|
|
|
typedef enum {
|
|
PLFIT_LBFGS,
|
|
PLFIT_LINEAR_SCAN,
|
|
PLFIT_PRETEND_CONTINUOUS,
|
|
PLFIT_DEFAULT_DISCRETE_METHOD = PLFIT_LBFGS
|
|
} plfit_discrete_method_t;
|
|
|
|
typedef enum {
|
|
PLFIT_P_VALUE_SKIP,
|
|
PLFIT_P_VALUE_APPROXIMATE,
|
|
PLFIT_P_VALUE_EXACT,
|
|
PLFIT_DEFAULT_P_VALUE_METHOD = PLFIT_P_VALUE_EXACT
|
|
} plfit_p_value_method_t;
|
|
|
|
typedef struct _plfit_result_t {
|
|
double alpha; /* fitted power-law exponent */
|
|
double xmin; /* cutoff where the power-law behaviour kicks in */
|
|
double L; /* log-likelihood of the sample */
|
|
double D; /* test statistic for the KS test */
|
|
double p; /* p-value of the KS test */
|
|
} plfit_result_t;
|
|
|
|
/********** structure that holds the options of plfit **********/
|
|
|
|
typedef struct _plfit_continuous_options_t {
|
|
plfit_bool_t finite_size_correction;
|
|
plfit_continuous_method_t xmin_method;
|
|
plfit_p_value_method_t p_value_method;
|
|
double p_value_precision;
|
|
plfit_mt_rng_t* rng;
|
|
} plfit_continuous_options_t;
|
|
|
|
typedef struct _plfit_discrete_options_t {
|
|
plfit_bool_t finite_size_correction;
|
|
plfit_discrete_method_t alpha_method;
|
|
struct {
|
|
double min;
|
|
double max;
|
|
double step;
|
|
} alpha;
|
|
plfit_p_value_method_t p_value_method;
|
|
double p_value_precision;
|
|
plfit_mt_rng_t* rng;
|
|
} plfit_discrete_options_t;
|
|
|
|
PLFIT_EXPORT int plfit_continuous_options_init(plfit_continuous_options_t* options);
|
|
PLFIT_EXPORT int plfit_discrete_options_init(plfit_discrete_options_t* options);
|
|
|
|
PLFIT_EXPORT extern const plfit_continuous_options_t plfit_continuous_default_options;
|
|
PLFIT_EXPORT extern const plfit_discrete_options_t plfit_discrete_default_options;
|
|
|
|
/********** continuous power law distribution fitting **********/
|
|
|
|
PLFIT_EXPORT int plfit_log_likelihood_continuous(const double* xs, size_t n, double alpha,
|
|
double xmin, double* l);
|
|
PLFIT_EXPORT int plfit_estimate_alpha_continuous(const double* xs, size_t n, double xmin,
|
|
const plfit_continuous_options_t* options, plfit_result_t* result);
|
|
PLFIT_EXPORT int plfit_continuous(const double* xs, size_t n,
|
|
const plfit_continuous_options_t* options, plfit_result_t* result);
|
|
|
|
/*********** discrete power law distribution fitting ***********/
|
|
|
|
PLFIT_EXPORT int plfit_estimate_alpha_discrete(const double* xs, size_t n, double xmin,
|
|
const plfit_discrete_options_t* options, plfit_result_t *result);
|
|
PLFIT_EXPORT int plfit_log_likelihood_discrete(const double* xs, size_t n, double alpha, double xmin, double* l);
|
|
PLFIT_EXPORT int plfit_discrete(const double* xs, size_t n, const plfit_discrete_options_t* options,
|
|
plfit_result_t* result);
|
|
|
|
/***** resampling routines to generate synthetic replicates ****/
|
|
|
|
PLFIT_EXPORT int plfit_resample_continuous(const double* xs, size_t n, double alpha, double xmin,
|
|
size_t num_samples, plfit_mt_rng_t* rng, double* result);
|
|
PLFIT_EXPORT int plfit_resample_discrete(const double* xs, size_t n, double alpha, double xmin,
|
|
size_t num_samples, plfit_mt_rng_t* rng, double* result);
|
|
|
|
/******** calculating the p-value of a fitted model only *******/
|
|
|
|
PLFIT_EXPORT int plfit_calculate_p_value_continuous(const double* xs, size_t n,
|
|
const plfit_continuous_options_t* options, plfit_bool_t xmin_fixed,
|
|
plfit_result_t *result);
|
|
PLFIT_EXPORT int plfit_calculate_p_value_discrete(const double* xs, size_t n,
|
|
const plfit_discrete_options_t* options, plfit_bool_t xmin_fixed,
|
|
plfit_result_t *result);
|
|
|
|
/************* calculating descriptive statistics **************/
|
|
|
|
PLFIT_EXPORT int plfit_moments(const double* data, size_t n, double* mean, double* variance,
|
|
double* skewness, double* kurtosis);
|
|
|
|
PLFIT_END_C_DECLS
|
|
|
|
#endif /* PLFIT_H */
|