[PD] feature extraction

[Mathieu Bouchard]

On Mon, 18 Jul 2005, matthew jones wrote:

> In a mathematical proof this coefficient is equal to 1 exactly, although
> this is an IIR filter on the LIMIT of stability and with floating point
> arithmetic it should rather be set to 0.999999999.

With Pd floats this number doesn't exist and thus gets rounded to 1, which 
is just as bad.

1 - 2^24 = 0.999999940395355 is the biggest number smaller than one.

with 64-bit floats (not used in Pd) it's instead 1 - 2^53.

the constants 24 and 53 are always one more than the number of significant
_binary_ digits in that format. (the number of significant _decimal_
digits is 3.332 smaller than that)



,-o--------o--------o--------o-. ,---. irc.freenode.net #dataflow |
| The Diagram is the Program tm| | ,-o-------------o--------------o-.
`-o------------o-------------o-' | | Mathieu Bouchard (Montréal QC) |
  | téléphone:+1.514.383.3801`---' `-o-- http://artengine.ca/matju -'