Double-x subscript in Pxx, Signal Process Toolbox document

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Bob Li
Bob Li 2011년 12월 28일
Hi,
In Signal Processing Toolbox User’s Guide R2011b, 6-5, page 179, http://www.mathworks.com/help/pdf_doc/signal/signal_tb.pdf, I am curious why the document uses double-x in Pxx notation, as well as Rxx.
I think one x or without x might be more appropriate. For example, as the notation in the Wikipedia page http://en.wikipedia.org/wiki/Spectral_density#Power_spectral_density.
Could anyone explain the reason?
Bob

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bym
bym 2011년 12월 28일
I guess to differentiate it from cross power spectrum Pxy

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