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<div class="title">NFFT.h</div> </div>
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">// -*- C++ -*-</span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment">// -*- coding: utf-8 -*-</span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment">//</span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment">// Author: Brian Hawkins</span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment">// Copyright 2019-</span></div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment">//</span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> </div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="preprocessor">#pragma once</span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="preprocessor">#include "forward.h"</span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> </div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="preprocessor">#include <cmath></span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="preprocessor">#include <valarray></span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> </div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="preprocessor">#include <isce3/core/Constants.h></span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="preprocessor">#include <isce3/core/Kernels.h></span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="preprocessor">#include "Signal.h"</span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> </div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span> <span class="keyword">template</span><<span class="keyword">class</span> T></div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span> <span class="keyword">class </span><a class="code" href="classisce3_1_1signal_1_1NFFT.html">isce3::signal::NFFT</a> {</div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  <span class="keyword">public</span>:</div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  <a class="code" href="classisce3_1_1signal_1_1NFFT.html#a5ff6e3247612b9df0d5eea9b36f871ac">NFFT</a>(<span class="keywordtype">size_t</span> m, <span class="keywordtype">size_t</span> n, <span class="keywordtype">size_t</span> fft_size);</div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span> </div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  <span class="keywordtype">void</span> <a class="code" href="classisce3_1_1signal_1_1NFFT.html#a1949aa186d42ea8338be9bc3149454a5">execute</a>(<span class="keyword">const</span> std::valarray<std::complex<T>> &spectrum,</div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  <span class="keyword">const</span> std::valarray<double> &times,</div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  std::valarray<std::complex<T>> &out);</div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span> </div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  <span class="keywordtype">void</span> <a class="code" href="classisce3_1_1signal_1_1NFFT.html#a1949aa186d42ea8338be9bc3149454a5">execute</a>(<span class="keywordtype">size_t</span> isize, <span class="keywordtype">size_t</span> istride,</div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  <span class="keyword">const</span> std::complex<T> *spectrum,</div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  <span class="keywordtype">size_t</span> tsize, <span class="keywordtype">size_t</span> tstride,</div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  <span class="keyword">const</span> <span class="keywordtype">double</span> *times,</div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  <span class="keywordtype">size_t</span> osize, <span class="keywordtype">size_t</span> ostride,</div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  std::complex<T> *out);</div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span> </div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  <span class="keywordtype">void</span> <a class="code" href="classisce3_1_1signal_1_1NFFT.html#ad187fb4d01d60fee5077886d4ff2327d">execute_adjoint</a>(<span class="keyword">const</span> std::valarray<std::complex<T>> &time_series,</div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  <span class="keyword">const</span> std::valarray<double> &times,</div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  std::valarray<std::complex<T>> &spectrum);</div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span> </div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  <span class="keywordtype">void</span> <a class="code" href="classisce3_1_1signal_1_1NFFT.html#ad187fb4d01d60fee5077886d4ff2327d">execute_adjoint</a>(<span class="keywordtype">size_t</span> isize, <span class="keywordtype">size_t</span> istride,</div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  <span class="keyword">const</span> std::complex<T> *time_series,</div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  <span class="keywordtype">size_t</span> tsize, <span class="keywordtype">size_t</span> tstride,</div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  <span class="keyword">const</span> <span class="keywordtype">double</span> *times,</div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  <span class="keywordtype">size_t</span> osize, <span class="keywordtype">size_t</span> ostride,</div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  std::complex<T> *spectrum);</div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span> </div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span> </div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  <span class="keywordtype">void</span> <a class="code" href="classisce3_1_1signal_1_1NFFT.html#a8c8e63d95e4b229d4528f1d80621176c">set_spectrum</a>(<span class="keyword">const</span> std::valarray<std::complex<T>> &x);</div>
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span> </div>
<div class="line"><a name="l00152"></a><span class="lineno"> 152</span>  <span class="keywordtype">void</span> <a class="code" href="classisce3_1_1signal_1_1NFFT.html#a8c8e63d95e4b229d4528f1d80621176c">set_spectrum</a>(<span class="keywordtype">size_t</span> size, <span class="keywordtype">size_t</span> stride, <span class="keyword">const</span> std::complex<T> *x);</div>
<div class="line"><a name="l00153"></a><span class="lineno"> 153</span> </div>
<div class="line"><a name="l00161"></a><span class="lineno"> 161</span>  std::complex<T> <a class="code" href="classisce3_1_1signal_1_1NFFT.html#a54bdade82e80eeca7615b737d7ec2dd4">interp</a>(<span class="keywordtype">double</span> t) <span class="keyword">const</span>;</div>
<div class="line"><a name="l00162"></a><span class="lineno"> 162</span> </div>
<div class="line"><a name="l00163"></a><span class="lineno"> 163</span>  <span class="keywordtype">size_t</span> size_kernel()<span class="keyword"> const </span>{<span class="keywordflow">return</span> 2*_m+1;}</div>
<div class="line"><a name="l00164"></a><span class="lineno"> 164</span>  <span class="keywordtype">size_t</span> size_spectrum()<span class="keyword"> const </span>{<span class="keywordflow">return</span> _n;}</div>
<div class="line"><a name="l00165"></a><span class="lineno"> 165</span>  <span class="keywordtype">size_t</span> size_transform()<span class="keyword"> const </span>{<span class="keywordflow">return</span> _fft_size;}</div>
<div class="line"><a name="l00166"></a><span class="lineno"> 166</span> </div>
<div class="line"><a name="l00167"></a><span class="lineno"> 167</span>  <span class="keyword">private</span>:</div>
<div class="line"><a name="l00168"></a><span class="lineno"> 168</span>  <span class="keywordtype">size_t</span> _m, _n, _fft_size;</div>
<div class="line"><a name="l00169"></a><span class="lineno"> 169</span>  std::valarray<std::complex<T>> _xf, _xt;</div>
<div class="line"><a name="l00170"></a><span class="lineno"> 170</span>  std::valarray<T> _weights;</div>
<div class="line"><a name="l00171"></a><span class="lineno"> 171</span>  <a class="code" href="classisce3_1_1core_1_1NFFTKernel.html">isce3::core::NFFTKernel<T></a> _kernel;</div>
<div class="line"><a name="l00172"></a><span class="lineno"> 172</span>  <a class="code" href="classisce3_1_1signal_1_1Signal.html">isce3::signal::Signal<T></a> _fft;</div>
<div class="line"><a name="l00173"></a><span class="lineno"> 173</span> };</div>
<div class="ttc" id="classisce3_1_1signal_1_1NFFT_html"><div class="ttname"><a href="classisce3_1_1signal_1_1NFFT.html">isce3::signal::NFFT</a></div><div class="ttdoc">Non-equispaced fast Fourier transform (NFFT) </div><div class="ttdef"><b>Definition:</b> forward.h:9</div></div>
<div class="ttc" id="classisce3_1_1signal_1_1Signal_html"><div class="ttname"><a href="classisce3_1_1signal_1_1Signal.html">isce3::signal::Signal< T ></a></div></div>
<div class="ttc" id="classisce3_1_1signal_1_1NFFT_html_a5ff6e3247612b9df0d5eea9b36f871ac"><div class="ttname"><a href="classisce3_1_1signal_1_1NFFT.html#a5ff6e3247612b9df0d5eea9b36f871ac">isce3::signal::NFFT::NFFT</a></div><div class="ttdeci">NFFT(size_t m, size_t n, size_t fft_size)</div><div class="ttdoc">NFFT Constructor. </div><div class="ttdef"><b>Definition:</b> NFFT.cpp:20</div></div>
<div class="ttc" id="classisce3_1_1signal_1_1NFFT_html_a54bdade82e80eeca7615b737d7ec2dd4"><div class="ttname"><a href="classisce3_1_1signal_1_1NFFT.html#a54bdade82e80eeca7615b737d7ec2dd4">isce3::signal::NFFT::interp</a></div><div class="ttdeci">std::complex< T > interp(double t) const </div><div class="ttdoc">Interpolate the transformed signal. </div><div class="ttdef"><b>Definition:</b> NFFT.cpp:101</div></div>
<div class="ttc" id="classisce3_1_1signal_1_1NFFT_html_a8c8e63d95e4b229d4528f1d80621176c"><div class="ttname"><a href="classisce3_1_1signal_1_1NFFT.html#a8c8e63d95e4b229d4528f1d80621176c">isce3::signal::NFFT::set_spectrum</a></div><div class="ttdeci">void set_spectrum(const std::valarray< std::complex< T >> &x)</div><div class="ttdoc">Ingest a spectrum for transform. </div><div class="ttdef"><b>Definition:</b> NFFT.cpp:92</div></div>
<div class="ttc" id="classisce3_1_1core_1_1NFFTKernel_html"><div class="ttname"><a href="classisce3_1_1core_1_1NFFTKernel.html">isce3::core::NFFTKernel< T ></a></div></div>
<div class="ttc" id="classisce3_1_1signal_1_1NFFT_html_a1949aa186d42ea8338be9bc3149454a5"><div class="ttname"><a href="classisce3_1_1signal_1_1NFFT.html#a1949aa186d42ea8338be9bc3149454a5">isce3::signal::NFFT::execute</a></div><div class="ttdeci">void execute(const std::valarray< std::complex< T >> &spectrum, const std::valarray< double > &times, std::valarray< std::complex< T >> &out)</div><div class="ttdoc">Execute a transform. </div><div class="ttdef"><b>Definition:</b> NFFT.cpp:132</div></div>
<div class="ttc" id="classisce3_1_1signal_1_1NFFT_html_ad187fb4d01d60fee5077886d4ff2327d"><div class="ttname"><a href="classisce3_1_1signal_1_1NFFT.html#ad187fb4d01d60fee5077886d4ff2327d">isce3::signal::NFFT::execute_adjoint</a></div><div class="ttdeci">void execute_adjoint(const std::valarray< std::complex< T >> &time_series, const std::valarray< double > &times, std::valarray< std::complex< T >> &spectrum)</div><div class="ttdoc">Execute an adjoint transform. </div><div class="ttdef"><b>Definition:</b> NFFT.cpp:195</div></div>
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