psd estimation no matplotlib

[Jack Yu]

Hi all,
Is there a function psd() for estimating power spectral density that is not
dependent on the importing of matplotlib or pylab, like there is
numpy.linalg.svd() to pylab.svd().  I would like to run some codes which
estimate psd on the computing nodes on a cluster, but the system
administrator says that it is impractical to install matplotlib on all of
them, because it requires X window, which takes up a lot of memory, which
the computing nodes do not have.  Thanks for any help in advance.

Cheers,

Jack
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