Le vendredi 03 février 2012 à 12:11 +0000, David Craig a écrit :
> Hi, I am using matplotlib to produce some spectrograms for seismic
> data. I am looking at a 10 day period with a sample rate of 20sps. I
> would like to have my spectrogram to be composed of 10 minute windows
> with an overlap of 90%. However when I try and run my script I run out
> of memory. I can produce the spectrogram for a maximum of 3 days
> before an error occurs.
> I have also tried to produce a spectrogram for each day and stick them
> together using subplot, but I then get the error given below. Anyone
> know a way around this??
> Thanks,
> David
It seems that the MemoryError does not occur when computing the
spectrogram, but when rendering it. A quick rule of a thumb tells me
that you have to display an image that is 12000x14400:
12000 frequencies, as you are using windows with 12000 samples
(no padded assumed)
14400 windows, due to the 90% overlap
Having a 4-channel for the RGBA image may throw the MemoryError.
Can you check by trying to "imshow" such an array ?
You can also reduce the overlap, the one you used lead to a spectrum
computation each minute...
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