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/* Copyright (C) 2017 Massachusetts Institute of Technology.
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <stdlib.h>
#include <stdio.h>
#include <time.h>
#include <math.h>
#include "config.h"
#include "check.h"
#include "harminv-int.h"
#include "copyright.h"
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#ifdef HAVE_GETOPT_H
# include <getopt.h>
#endif
int verbose = 0;
#define TWOPI 6.2831853071795864769252867665590057683943388
#define NPERIODS 10
void usage(FILE *f)
{
fprintf(f, "Usage: sines [options] <freq>...\n"
"Note that Im[freq] is the decay rate, or its inverse for -T.\n"
"Options: \n"
" -h : this help message\n"
" -V : print version number and copyright\n"
" -v : verbose output\n"
" -T : specify periods instead of frequencies\n"
" -R : real output\n"
" -r : random amplitudes\n"
" -N <a> : add white noise with amplitude <a>\n"
" -s <s> : use seed <s> for random #s (default <s>=time)\n"
" -n <n> : output <n> points (default %d * max period)\n"
" -t <dt> : time step <dt> (default 1.0)\n",
NPERIODS);
}
typedef struct {
double freq, decay, amplitude, phase;
} sinusoid;
#define MAX2(a,b) ((a) > (b) ? (a) : (b))
int main(int argc, char **argv)
{
int c;
extern char *optarg;
extern int optind;
int iarg;
int specify_periods = 0;
int random_amplitudes = 0;
int real_output = 0;
sinusoid *sines = NULL;
int nsines = 0, nalloc = 0, n = 0;
double max_period = 0;
double dt = 1.0;
double noise = 0.0;
int i, is;
srand(time(NULL));
while ((c = getopt(argc, argv, "hVvTRrn:t:N:s:")) != -1)
switch (c) {
case 'h':
usage(stdout);
return EXIT_SUCCESS;
case 'V':
printf("sines " PACKAGE_VERSION " by Steven G. Johnson.\n"
"Test program for harminv.\n"
COPYRIGHT);
return EXIT_SUCCESS;
case 'v':
verbose = 1;
break;
case 'T':
specify_periods = 1;
break;
case 'R':
real_output = 1;
break;
case 'r':
random_amplitudes = 1;
break;
case 'N':
noise = atof(optarg);
break;
case 's':
srand(atoi(optarg));
break;
case 'n':
n = atoi(optarg);
if (n < 1) {
fprintf(stderr, "sines: "
"invalid non-positive -n argument %d\n", n);
return EXIT_FAILURE;
}
break;
case 't':
dt = atof(optarg);
break;
default:
fprintf(stderr, "sines: invalid argument -%c\n", c);
usage(stderr);
return EXIT_FAILURE;
}
if (optind == argc) { /* no parameters left */
fprintf(stderr, "sines: missing required frequency(ies)\n");
usage(stderr);
return EXIT_FAILURE;
}
for (iarg = optind; iarg < argc; ++iarg) {
sinusoid s = { 0, 0, 0, 0 };
if (sscanf(argv[iarg], "%lf+%lfi", &s.freq, &s.decay) < 1) {
fprintf(stderr, "sines: invalid argument \"%s\"\n",
argv[iarg]);
return EXIT_FAILURE;
}
if (specify_periods) {
if (s.freq == 0) {
fprintf(stderr, "sines: invalid argument \"%s\""
": 0 not a valid period\n", argv[iarg]);
return EXIT_FAILURE;
}
s.freq = 1/s.freq;
if (s.decay != 0)
s.decay = 1/s.decay;
}
if (s.decay == 0 || fabs(1/s.freq) > 1/s.decay)
max_period = MAX2(max_period, fabs(1/s.freq));
else
max_period = MAX2(max_period, 1/s.decay);
if (random_amplitudes) {
s.amplitude = rand() * 1.0/RAND_MAX;
s.phase = rand() * TWOPI/RAND_MAX - TWOPI/2;
}
else {
s.amplitude = (iarg - optind + 1);
s.phase = (iarg - optind + 1) * TWOPI / (argc-optind) - TWOPI/2;
}
if (verbose)
printf("# mode: frequency = %g (period %g), decay = %g (lifetime %g), amplitude = %g, phase = %g\n", s.freq, 1/s.freq, s.decay, s.decay != 0 ? 1/s.decay : 0, s.amplitude, s.phase);
if (nsines >= nalloc) {
nalloc = (nalloc + 1) * 2;
sines = (sinusoid*) realloc(sines, sizeof(sinusoid) * nalloc);
CHECK(sines, "out of memory");
}
sines[nsines++] = s;
}
if (n == 0 && max_period == 0) {
fprintf(stderr, "sines: must specify -n or non-zero period\n");
return EXIT_FAILURE;
}
if (n == 0)
n = (int) (max_period / fabs(dt) + 0.5) * NPERIODS;
for (i = 0; i < n; ++i) {
cmplx output = 0;
for (is = 0; is < nsines; ++is)
output += sines[is].amplitude *
cexp(I * (sines[is].phase - TWOPI*sines[is].freq * i*dt)
- sines[is].decay * i*dt);
output += noise * (rand() * 2.0/RAND_MAX - 1);
if (real_output)
printf("%0.17e\n", creal(output));
else
printf("%0.17e%+0.17ei\n", creal(output), cimag(output));
}
free(sines);
return EXIT_SUCCESS;
}
#ifdef F77_DUMMY_MAIN
# ifdef __cplusplus
extern "C"
# endif
int F77_DUMMY_MAIN() { return 1; }
#endif