1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
|
/*
* spectrum_check.c
*
* Check that Spectrum object works
*
* Copyright © 2019-2020 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/>.
*
*/
#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.area = 1.0;
spectrum_set_gaussians(s, &gauss, 1);
r += check_integral(s, 100);
spectrum_free(s);
s = spectrum_generate_sase(ph_eV_to_lambda(9000), 0.01, 0.0001, rng);
r += check_integral(s, 100);
plot_spectrum(s);
spectrum_free(s);
s = spectrum_generate_gaussian(ph_eV_to_lambda(9000), 0.01);
r += check_integral(s, 100);
spectrum_free(s);
s = spectrum_generate_tophat(ph_eV_to_lambda(9000), 0.01);
r += check_integral(s, 100);
spectrum_free(s);
s = spectrum_generate_twocolour(ph_eV_to_lambda(9000), 0.001, ph_eV_to_k(100));
r += check_integral(s, 100);
spectrum_free(s);
gsl_rng_free(rng);
return r;
}
|
