93 lines
3.2 KiB
C++
93 lines
3.2 KiB
C++
/*+
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This is CosmoTool (./sample/test_fft_calls.cpp) -- Copyright (C) Guilhem Lavaux (2007-2013)
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guilhem.lavaux@gmail.com
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This software is a computer program whose purpose is to provide a toolbox for cosmological
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data analysis (e.g. filters, generalized Fourier transforms, power spectra, ...)
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This software is governed by the CeCILL license under French law and
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abiding by the rules of distribution of free software. You can use,
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modify and/ or redistribute the software under the terms of the CeCILL
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license as circulated by CEA, CNRS and INRIA at the following URL
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"http://www.cecill.info".
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As a counterpart to the access to the source code and rights to copy,
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modify and redistribute granted by the license, users are provided only
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with a limited warranty and the software's author, the holder of the
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economic rights, and the successive licensors have only limited
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liability.
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In this respect, the user's attention is drawn to the risks associated
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with loading, using, modifying and/or developing or reproducing the
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software by the user in light of its specific status of free software,
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that may mean that it is complicated to manipulate, and that also
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therefore means that it is reserved for developers and experienced
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professionals having in-depth computer knowledge. Users are therefore
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encouraged to load and test the software's suitability as regards their
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requirements in conditions enabling the security of their systems and/or
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data to be ensured and, more generally, to use and operate it in the
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same conditions as regards security.
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The fact that you are presently reading this means that you have had
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knowledge of the CeCILL license and that you accept its terms.
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+*/
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#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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template<typename T>
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void test_2d(int Nx, int Ny)
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{
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EuclidianFourierTransform_2d<T> dft(Nx,Ny,1.0,1.0);
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EuclidianSpectrum_1D<T> 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.fourierSpace().scale(std::complex<T>(0,0));
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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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spectrum.newRandomFourier(rng, dft.fourierSpace());
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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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gsl_rng_free(rng);
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}
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int main(int argc, char **argv)
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{
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test_2d<double>(128,128);
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test_2d<double>(131,128);
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test_2d<double>(130,128);
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test_2d<float>(128,128);
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test_2d<float>(128,131);
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test_2d<float>(128,130);
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return 0;
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}
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