log scale y-axis for periodogram
12 views (last 30 days)
Show older comments
The periodograms from an electronic signal I am analyzing have such high power periodicity in the low frequency bandwidths that, without zooming in on the data, these are almost impossible to read. (see the example below) Is it possible, when using the [(pxx,f) = periodogram(x,window,nfft)], to adjust the y-axis to a log-scale to improve the graph's readibility? The y-axis in the example represents the magnitude of the periodogram (i.e. abs(pxx)).
0 Comments
Answers (1)
Mischa Kim
on 11 Feb 2014
Edited: Mischa Kim
on 11 Feb 2014
Philippe, it is. Use
pxx = periodogram(x,window,nfft)
plot(10*log10(pxx))
to plot the periodogram.
2 Comments
Mischa Kim
on 11 Feb 2014
I am not quite sure I understand. For plotting frequency vs. pxx you would use
plot(f,10*log(pxx))
instead, correct. Is that what you are referring to? Or are you still not able to get the log-scale on the y-axis?
See Also
Categories
Find more on Spectral Estimation in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!