mirror of
https://github.com/aportelli/LatAnalyze.git
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91 lines
2.7 KiB
C++
91 lines
2.7 KiB
C++
/*
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* GslFFT.cpp, part of LatAnalyze
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*
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* Copyright (C) 2013 - 2020 Antonin Portelli
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*
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* LatAnalyze is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* LatAnalyze is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with LatAnalyze. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <LatAnalyze/Numerical/GslFFT.hpp>
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#include <LatAnalyze/includes.hpp>
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using namespace std;
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using namespace Latan;
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/******************************************************************************
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* GslFFT implementation *
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******************************************************************************/
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// constructor /////////////////////////////////////////////////////////////////
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GslFFT::GslFFT(const Index size)
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{
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resize(size);
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}
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// destructor //////////////////////////////////////////////////////////////////
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GslFFT::~GslFFT(void)
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{
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clear();
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}
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// size ////////////////////////////////////////////////////////////////////////
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void GslFFT::resize(const Index size)
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{
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if (size_ != size)
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{
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clear();
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size_ = size;
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wavetable_ = gsl_fft_complex_wavetable_alloc(size_);
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workspace_ = gsl_fft_complex_workspace_alloc(size_);
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}
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}
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// fft /////////////////////////////////////////////////////////////////////////
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void GslFFT::operator()(CMat &x, const unsigned int dir)
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{
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if (x.size() != size_)
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{
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LATAN_ERROR(Size, "wrong input vector size");
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}
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else
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{
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switch (dir)
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{
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case FFT::Forward:
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gsl_fft_complex_forward((double *)x.data(), 1, size_,
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wavetable_, workspace_);
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break;
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case FFT::Backward:
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gsl_fft_complex_backward((double *)x.data(), 1, size_,
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wavetable_, workspace_);
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break;
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default:
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LATAN_ERROR(Argument, "invalid FT direction");
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break;
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}
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}
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}
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// destroy GSL objects /////////////////////////////////////////////////////////
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void GslFFT::clear(void)
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{
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if (!wavetable_)
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{
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gsl_fft_complex_wavetable_free(wavetable_);
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}
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if (!workspace_)
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{
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gsl_fft_complex_workspace_free(workspace_);
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}
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}
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