52 lines
1.2 KiB
C++
52 lines
1.2 KiB
C++
#include <math.hpp>
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#include <cmath>
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#include <fstream>
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#include <ctime>
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void create_plot_file(std::string filename, const math::csignal& tfd) {
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std::ofstream data_file(filename + ".data");
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for (int i=0; i<tfd.size(); ++i) {
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data_file << tfd[i].real()
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<< " "
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<< tfd[i].imag()
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<< std::endl;
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}
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data_file.close();
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}
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int main(int argc, char** argv) {
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math::csignal s;
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double fe = 6000;
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double f0 = 400;
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int n = 30;
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if (argc > 1) {
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n = atoi(argv[1]);
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}
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for (int i=0; i<100; ++i) {
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s.push_back(math::complex(std::sin(2*math::pi()*f0*float(i)/fe), 0));
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}
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std::cout << math::mean(s) << std::endl;
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math::csignal tfd;
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clock_t begin = std::clock();
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for (int i=0; i<n; ++i) {
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tfd = math::fft(s, 2000);
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}
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clock_t end = clock();
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std::cout << "Time to compute " << n << " fft: "<< double(end-begin) / CLOCKS_PER_SEC << std::endl;
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std::cout << "Average time: " << double(end-begin) / CLOCKS_PER_SEC / n << std::endl;
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math::csignal mod;
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for (int i=0; i<tfd.size(); ++i) {
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double R = tfd[i].real();
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double I = tfd[i].imag();
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double a = std::sqrt(R*R + I*I);
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mod.push_back(math::complex(float(i)/tfd.size()*fe, a));
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}
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create_plot_file("graph", mod);
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return 0;
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}
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