52 lines
1.4 KiB
C++
52 lines
1.4 KiB
C++
#include <boost/format.hpp>
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#include "yorick.hpp"
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#include <gsl/gsl_rng.h>
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#include <iostream>
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#include <cmath>
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#include "fourier/euclidian.hpp"
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using namespace CosmoTool;
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using boost::format;
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using boost::str;
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using namespace std;
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double spectrum_generator(double k)
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{
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if (k==0)
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return 0;
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return 1/(0.01+pow(k, 3.0));
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}
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void test_2d(int Nx, int Ny)
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{
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EuclidianFourierTransform_2d<double> dft(Nx,Ny,1.0,1.0);
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EuclidianSpectrum_1D<double> spectrum(spectrum_generator);
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double volume = Nx*Ny;
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gsl_rng *rng = gsl_rng_alloc(gsl_rng_default);
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dft.realSpace().eigen().setRandom();
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dft.analysis();
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cout << format("Testing (%d,%d)") % Nx % Ny << endl;
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cout << "Map dot-product = " << dft.realSpace().dot_product(dft.realSpace()) << endl;
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cout << "Fourier dot-product = " << dft.fourierSpace().dot_product(dft.fourierSpace()).real()*volume << endl;
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dft.synthesis();
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cout << "Resynthesis dot-product = " << dft.realSpace().dot_product(dft.realSpace()) << endl;
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dft.realSpace().scale(2.0);
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dft.fourierSpace().scale(0.2);
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SpectrumFunction<double>::FourierMapPtr m = spectrum.newRandomFourier(rng, dft.fourierSpace());
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dft.fourierSpace() = *m.get();
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dft.synthesis();
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uint32_t dims[2] = { Ny, Nx };
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CosmoTool::saveArray(str(format("generated_map_%d_%d.nc") %Nx % Ny) , dft.realSpace().data(), dims, 2);
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}
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int main(int argc, char **argv)
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{
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test_2d(128,128);
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test_2d(131,128);
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return 0;
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}
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