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−% Test fft() operator for AOs.
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−%
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−% M Hewitson 19-04-07
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−%
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−% $Id: test_fft.m,v 1.14 2009/07/24 13:38:19 luigi Exp $
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−%
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−function test_fft()
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−  
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−  
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−  % Make test AOs
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−  nsecs = 10;
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−  fs    = 1000;  
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−  pl = plist('nsecs', nsecs, 'fs', fs, 'tsfcn', 'sin(2*pi*7.433*t) + randn(size(t))');
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−  a1 = ao(pl);
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−  a1 = a1.setName;
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−  
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−  % Take plain one sided
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−  a2 = fft(a1,plist('type','plain'));
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−  iplot(abs(a2), plist('XScales', {'All', 'lin'}));
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−  
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−  % Take abs of one-sided
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−  a3 = abs(fft(a1,plist('type','one'))).^2;
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−  a4 = psd(a1, plist('Nfft', 10000, 'Win', specwin('Rectangular', 10000)));
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−  
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−  % Plot ratio
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−  rat = a3./a4;
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−  
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−  iplot(rat, plist('YScales', 'lin'))
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−  iplot(a3,a4)
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−  
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−  % Two-sided fft
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−  a5 = fft(a1, plist('type', 'two'));
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−  iplot(abs(a5), plist('XScales', {'All', 'lin'}));
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−  
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−end
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−% END