Contourf plot Yscale log2 vs log10
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Anas Khan
am 14 Jul. 2022
Kommentiert: Star Strider
am 14 Jul. 2022
I have frequencies ranging from 2-194 in a base-2 logarithmic spacing (10 voices per octave) like this:
frex = 2.^([10:76]/10);
I want to plot a spectrogram with contourf using them and make the yaxis logarithmically scaled. I know that the below command does this for base-10 log, but how can I do it for base-2 log? I saw some other questions asking similar, but I don't think the answers actually changed the scale of the y-axis. One person said that log10 and log2 scale shape will be the same. Is that correct?
set(gca,'YScale','log')
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Star Strider
am 14 Jul. 2022
You can change the base of the logarithm by dividing it by the desired base, then use the appropriate code to change the tick labels:
frex = 2.^((10:76)/10)
frex2 = log(frex)/log(2)
N = 1024;
n = 0:N-1;
w0 = 2*pi/5;
x = sin(w0*n)+10*sin(2*w0*n);
% Compute the short-time Fourier transform using the function defaults. Plot the spectrogram.
figure
spectrogram(x,'yaxis');
figure
spectrogram(x,'yaxis')
Ax = gca;
yt = Ax.YTick;
Ax.YTickLabel = log(yt)/log(2);
This example is from the spectrogram documentation, with my changes to the y-axis labels.
.
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