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/**
*
* Take a file which contains pairs in the form:
*
* k q
*
* compute qnn(k) and fit this function with a power-law
*
* a*x^{b}
*
* The fit is actually performed as a linear fit on the
* exponential-binned log-log distribution
*
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <gsl/gsl_fit.h>
#include "fit_utils.h"
int main(int argc, char *argv[]){
double *k, *q, *x, *y;
int N, num;
double alpha;
double c0, c1, cov00, cov01, cov11, sqsum;
k=q=x=y=NULL;
if (argc < 3){
printf("%s <filein> <alpha>\n", argv[0]);
exit(1);
}
alpha=atof(argv[2]);
fprintf(stderr,"Alpha: %g\n", alpha);
load_sequence_col(argv[1], &k, &N, 0);
load_sequence_col(argv[1], &q, &N, 1);
//exit(1);
exp_bin_avg(k, q, N, alpha, &x, &y, &num);
//normalize_distr(x, y, num);
//dump_distr(x, y, num);
compact_distr(x, y, &num);
// dump_distr(x,y,num);
map_vec(x, num, log);
map_vec(y, num, log);
//dump_distr(x,y,num);
gsl_fit_linear(x, 1, y, 1, num, &c0, &c1, &cov00, &cov01, &cov11, &sqsum);
fprintf(stderr, "a: %g b: %g\n", exp(c0), c1);
}
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