[PD] [cos~] broken for moderately large inputs

Mathieu Bouchard matju at artengine.ca
Tue Jan 11 15:11:40 CET 2011


On Tue, 11 Jan 2011, Claude Heiland-Allen wrote:

> Seems [cos~] only gives expected results between -1024 and 1024.
> Above  1024 the frequency halves,  halving again at  5120, etc.
> Below -1024 the frequency doubles, until chaos   at -3072.

You didn't give as much info as you did on IRC.

We found it to happen at 1*1024, 5*1024, 13*1024, 29*1024, 61*1024.

that's (pow(2,n)-3)*1024 (starts at n=2 and doesn not include the negative 
point(s)).

> http://claudiusmaximus.goto10.org/g/tech/cos~-test.pd.png
> http://claudiusmaximus.goto10.org/g/tech/cos~-test-2.pd.png
> http://claudiusmaximus.goto10.org/g/tech/cos~-test-3.pd.png

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| Mathieu Bouchard ---- tél: +1.514.383.3801 ---- Villeray, Montréal, QC


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