timefreq - calculation of short time spectrograms of a time series
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t=(0:1:9000) ./1200; fs=200 + 50 .*sin(2 .*%pi .*t /2); phi=cumsum(2 .*%pi .*fs ./1200); x=sin(phi); [spk,tax,fax]=timefreq(x,1200); plot3d(fax,tax,spk); // End of example timefreq