https://github.com/ntamas/plfit
test_discrete.c
/* test_discrete.c
*
* Copyright (C) 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.
*/
#include <math.h>
#include "plfit.h"
#include "test_common.h"
int test_discrete() {
plfit_result_t result;
plfit_discrete_options_t options;
double data[10000];
size_t n;
plfit_discrete_options_init(&options);
options.p_value_method = PLFIT_P_VALUE_SKIP;
n = test_read_file("discrete_data.txt", data, 10000);
ASSERT_NONZERO(n);
result.alpha = 2.58;
result.xmin = 2;
plfit_log_likelihood_discrete(data, n, result.alpha, result.xmin, &result.L);
ASSERT_ALMOST_EQUAL(result.L, -9155.62809, 1e-4);
result.alpha = 0;
result.xmin = 2;
options.alpha_method = PLFIT_PRETEND_CONTINUOUS;
plfit_estimate_alpha_discrete(data, n, result.xmin, &options, &result);
ASSERT_ALMOST_EQUAL(result.alpha, 2.43, 1e-1);
result.alpha = 0;
result.xmin = 2;
options.alpha_method = PLFIT_LBFGS;
plfit_estimate_alpha_discrete(data, n, result.xmin, &options, &result);
ASSERT_ALMOST_EQUAL(result.alpha, 2.58, 1e-1);
result.alpha = result.xmin = result.L = 0;
options.alpha_method = PLFIT_LINEAR_SCAN;
options.alpha.min = 1.01;
options.alpha.max = 5.0;
options.alpha.step = 0.01;
plfit_discrete(data, n, &options, &result);
ASSERT_ALMOST_EQUAL(result.alpha, 2.58, 1e-1);
ASSERT_EQUAL(result.xmin, 2);
ASSERT_ALMOST_EQUAL(result.L, -9155.62809, 1e-4);
result.alpha = result.xmin = result.L = 0;
options.alpha_method = PLFIT_DEFAULT_DISCRETE_METHOD;
plfit_discrete(data, n, &options, &result);
ASSERT_ALMOST_EQUAL(result.alpha, 2.58035, 1e-1);
ASSERT_EQUAL(result.xmin, 2);
ASSERT_ALMOST_EQUAL(result.L, -9155.617067, 1e-4);
return 0;
}
int main(int argc, char* argv[]) {
return test_discrete();
}