Last change
on this file since 122 was
51,
checked in by dtax, 12 years ago
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Nicer plot function for a spectrogram.
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File size:
763 bytes
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1 | % |
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2 | % SHOWSPEC(S) |
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3 | % SHOWSPEC(S,F,T) |
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4 | % |
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5 | % Show spectrogram S in a nice graph. When vectors F and T are given, |
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6 | % the appropriate frequencies (F) and timepoints (T) are plotted on the |
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7 | % vertical and horizontal axes, respectively. |
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8 | % When a spectrogram is constructed from the Matlab spectrogram.m, in |
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9 | % principle a complex-valued matrix S is obtained. If this is not |
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10 | % converted into something real-valued, the abs(S) is actually plotted |
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11 | % in the figure. |
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12 | |
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13 | function showspec(S,f,t) |
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14 | |
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15 | if ~isreal(S) |
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16 | S = abs(S); |
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17 | warning('showspec:NotRealS','Spectrum S is complex, using abs(S).'); |
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18 | end |
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19 | |
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20 | if nargin<2 |
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21 | imagesc(S); |
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22 | axis xy; |
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23 | xlabel('timepoint'); |
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24 | ylabel('frequency'); |
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25 | else |
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26 | imagesc(t,f,S); |
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27 | axis xy; |
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28 | xlabel('time (s)'); |
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29 | ylabel('frequency'); |
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30 | end |
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31 | |
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32 | |
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