[PD] help with pdf~ object (zexy)

IOhannes m zmölnig zmoelnig at iem.at
Tue Oct 13 20:34:40 CEST 2015

On 10/13/2015 08:19 PM, Benoit Fortier wrote:
> Ok thanks IOhannes, it was very counterintuitive to me but I think I understand this now : in the help patch, the pdf~ object draws a probability density fonction of values between -1 and 1 in an array (the size of the array can be specified as an argument) by doing a density estimation of the flow of samples coming in the signal inlet of the object. Thats what I needed to understand, but if, for the record, anyone want to complete this explanation or correct me on something I get wrong, i’d be happy to read you.

the only thing that is not accurately correct, is that [pdf~] doesn't do
an estimation.
it just *counts* how often each (quantized) value appears and outputs
that measurement (normalized by the total number of samples encountered).
that's why the result gets better the more samples it observes.


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