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POHow to use circshift in Matlab? What am I doing wrong?
 

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  1. POHow to use circshift in Matlab? What am I doing wrong?
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    <p>I would like to plot the "greasy" test signal in Matlab, and then plot a Gauss function in the same plot. The script below does that.</p> <p>But I would like to be able to place the Gauss function at a certain position, so I see that others often use CIRCSHIFT to move plots.</p> <p>When I use it I can move the Gauss function to the left or right, but not up and down.</p> <p>PGAUSS used in the script comes from the LTFAT DSP third party toolbox, but it could for debugging be any function. E.g. -x^2.</p> <p>Can someone figure out, what I am doing wrong?</p> <p>Here is how it looks with [0 0] <a href="http://img268.imageshack.us/img268/1130/66837635.png" rel="nofollow noreferrer">alt text http://img268.imageshack.us/img268/1130/66837635.png</a></p> <p>Here is how it looks with [0 111] <a href="http://img684.imageshack.us/img684/2386/0111q.png" rel="nofollow noreferrer">alt text http://img684.imageshack.us/img684/2386/0111q.png</a></p> <p>Here is how it looks with [111 0] <a href="http://img194.imageshack.us/img194/8760/1110d.png" rel="nofollow noreferrer">alt text http://img194.imageshack.us/img194/8760/1110d.png</a></p> <p>Lots of love, Louise</p> <pre><code>g = greasy; fs = 16000; Lg = length(g); % -2441 so just get the first 500 points L2 = floor(Lg/2)+1 - 2441; gf = greasy; gf = gf(1:L2); hold on plot (1:L2,gf); xlabel('Time / samples'); ylabel('Amplitude'); % Contructing values to make the plot look as desired L = 500; tfr = 1; cent = 300; %gw = pgauss(L,tfr,cent) % Here I would have expected the Gauss function to be % moved down, but nothing happens. gw = circshift(pgauss(L,tfr,cent), [0 -1]); plot(gw,'Color','red'); % Multiply the signal with the Gauss window figure(2); plot(gf.*gw); </code></pre>
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