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/*
* spectrum_check.c
*
* Check that Spectrum object works
*
* Copyright © 2019 Deutsches Elektronen-Synchrotron DESY,
* a research centre of the Helmholtz Association.
*
* Authors:
* 2019 Thomas White <taw@physics.org>
*
* This file is part of CrystFEL.
*
* CrystFEL 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 3 of the License, or
* (at your option) any later version.
*
* CrystFEL 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 CrystFEL. If not, see <http://www.gnu.org/licenses/>.
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
#include <spectrum.h>
#include <utils.h>
static int check_integral(Spectrum *s, int nsamp)
{
double min, max, step;
int i;
double area = 0.0;
spectrum_get_range(s, &min, &max);
fprintf(stderr, "bounds: %e %e\n", min, max);
step = (max-min)/nsamp;
for ( i=0; i<=nsamp; i++ ) {
double x = min+i*step;
double y = spectrum_get_density_at_k(s, x);
area += y * step;
}
fprintf(stderr, "Total area + %f\n", area);
if ( area > 1.1 ) return 1;
if ( area < 0.9 ) return 1;
return 0;
}
static void plot_spectrum(Spectrum *s)
{
double min, max, step;
int i;
const int nsamp = 100;
spectrum_get_range(s, &min, &max);
step = (max-min)/nsamp;
for ( i=0; i<=nsamp; i++ ) {
double x = min+i*step;
double y = spectrum_get_density_at_k(s, x);
printf("%e %e\n", x, y);
}
}
int main(int argc, char *argv[])
{
Spectrum *s;
struct gaussian gauss;
gsl_rng *rng;
int r = 0;
rng = gsl_rng_alloc(gsl_rng_mt19937);
s = spectrum_new();
gauss.kcen = ph_eV_to_k(9000);
gauss.sigma = ph_eV_to_k(100);
gauss.height = 1.0;
spectrum_set_gaussians(s, &gauss, 1);
r += check_integral(s, 100);
spectrum_free(s);
s = spectrum_generate_sase(ph_eV_to_k(9000), 0.01, 0.0005, rng);
plot_spectrum(s);
spectrum_free(s);
gsl_rng_free(rng);
return r;
}
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