[PD] help_random/seed

cem guney cemthemuteguney at yahoo.com
Mon Jul 6 10:53:40 CEST 2009

it's nice to observe that an extensive/productive conversation has come about 
from my question in regards to "random" systems, and it's quite 
informative to follow, and frankly a bit far from my current reach
of knowledge, but what is important for me at the moment 
is to learn the general difference between random & pseudo-random & the various 
applications that is possible with random systems via the several examples given.
will try to build from there...

thanks again folks, :)

Cem Güney
myspace. . lastfm. . tumblr. . cronica 

From: Martin Peach <martin.peach at sympatico.ca>
To: cem guney <cemthemuteguney at yahoo.com>
Cc: pd list <pd-list at iem.at>
Sent: Sunday, July 5, 2009 7:44:05 PM
Subject: Re: [PD] help_random/seed

cem guney wrote:
> hi,
>  thanks much for your response!
>  also in regards to your explanation,
>  "It would be nice if the random source could be independently specified for all the pd objects that use random numbers,
> since the count of unreachable combinations when using the standard deterministic chaos generators is infinite"
>  any application examples as to why it would be nice if the random source could be independently specified?

Well I think it's mainly a philosophical thing about the meaning of 'random', but probably there are sequence generators for music that sound different with 'truly' random vs pseudo-random numbers. Sometimes you may want a repeating chaotic sequence, sometimes a completely random one.

For cryptography, as in a one-time pad, pseudo-random is relatively easy to crack. There are at most 65536 different sequences with typical pseudo-random generators, but that's not any inherent limitation of pseudo-random, just the particular implementation that's often used.

Also with games like rolling dice or shuffling cards, you probably want it to be completely unpredictable, or regular players will begin to recognize patterns.

Pseudo-random white noise playing at audio rate will actually be a repeating waveform several minutes or hours long. It's up to you if that matters or not.


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