Add graph references

2026-06-28 13:49:01 +01:00
parent 0a9807e448
commit a11edf0c53
2578 changed files with 868045 additions and 0 deletions
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+/* 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 */