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comparison m-toolbox/test/test_fft.m @ 0:f0afece42f48

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author Daniele Nicolodi <nicolodi@science.unitn.it>
date Wed, 23 Nov 2011 19:22:13 +0100
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-1:000000000000 0:f0afece42f48
1 % Test fft() operator for AOs.
2 %
3 % M Hewitson 19-04-07
4 %
5 % $Id: test_fft.m,v 1.14 2009/07/24 13:38:19 luigi Exp $
6 %
7 function test_fft()
8
9
10 % Make test AOs
11 nsecs = 10;
12 fs = 1000;
13 pl = plist('nsecs', nsecs, 'fs', fs, 'tsfcn', 'sin(2*pi*7.433*t) + randn(size(t))');
14 a1 = ao(pl);
15 a1 = a1.setName;
16
17 % Take plain one sided
18 a2 = fft(a1,plist('type','plain'));
19 iplot(abs(a2), plist('XScales', {'All', 'lin'}));
20
21 % Take abs of one-sided
22 a3 = abs(fft(a1,plist('type','one'))).^2;
23 a4 = psd(a1, plist('Nfft', 10000, 'Win', specwin('Rectangular', 10000)));
24
25 % Plot ratio
26 rat = a3./a4;
27
28 iplot(rat, plist('YScales', 'lin'))
29 iplot(a3,a4)
30
31 % Two-sided fft
32 a5 = fft(a1, plist('type', 'two'));
33 iplot(abs(a5), plist('XScales', {'All', 'lin'}));
34
35 end
36 % END