posted 03 September 2010 11:26            

nextChaotic: seed: reset:

On p157 of the book we are given this expression:
(1 bpm: !BPM) nextChaotic: !Kaos seed: 0.2 reset: !Inject

No problem here I think - On each beat at the tempo given by the BPM fader generate a number between -1 and +1 using the Kaos fader as the value for 'a' in the Chaotic formula. The seed for the expression is 0.2. Use the Inject button to inject a random number for 'x'.

I think my interpretation is OK.

So here is my problem and I think it's a confusion over what seed means in this context- on p.373 the example for 'nextChaotic: seed:' is given as:

nextChaotic: !k

with I imagine a fader 'k' supplying the value for 'a' -but where is the seed? Surely it should be of the form nextChaotic: !k seed: 0.2 (or whatever value)

On a side note- (and this may be relevant to my confusion) why is the seed value for the examples for the Random and RandomExp on p372/373 given as 3413 which lies way outside of (-1,1).
Surely a seed is a number used to initialize a random number generator so in what way does 3413 do this in the expression (1 bpm: 60) nextRandomWithSeed 3413 ?

Any help is much appreciated.

posted 18 September 2010 11:20            

If you use nextChaotic: without the seed, it will use a seed of 0.5. If you use the version that has reset:, then you can force it to reset itself to the seed value. In nextChaotic: the seed is literally the first output value (and the output value on reset).