I have a given signal. I know that I want to transform it with a Haar wavelet, and so I used wavedec to do just that:
[c,dcoeff] = wavedec(voltages,5,'haar')
This gives me back the coefficients. I also got the detail coefficient vectors:
I want to plot this in the time-frequency domain to get an image much like this:
...but I have no idea how to do that just from the data above. Could anyone please share a time-frequency-amplitude plot code for wavelet transformed signals?