[PD] spectrogram in PD

[Mathieu Bouchard]

On Mon, 13 Nov 2006, andrea valle wrote:

> I was trying to understand if there's a(n easy) way to plot a spectrum. 
> I guess it should be easily feasible, as I saw both pd capabilties in 
> time domain, both Miller Puckette's figures in the book.
> But looking in docs and on the web I got confused and I'm not able to find 
> answers to my question.

You can combine [fft~] with [tabsend~] and [table]. Clicking on the 
[table] will show you the contents. If you want to make a polar transform, 
you may want to combine cos and sin like [expr~ sqrt($v1*$v1+$v2*$v2)] to 
get an amplitude plot. If you want a phase plot you can use [expr~ 
atan($v1,$v2)] or maybe it's $v2 first.

If you want something fancier, have a look at 
http://gridflow.ca/gallery/spectrogram.gif

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