I'm a bit of a monkey. Not much of a mathematician.

This is something i've been wrestling with for a while and now i've managed to get it to work, but i'm not sure if it should.

I wondering what y'all think and if there are better ways to do this. I'm pretty sure there are.

http://www.pdpatchrepo.info/hurleur/eureka.pd

The attached patch takes a different approach: instead of looping until you find a different random number from the first one (which might loop forever, if you're unlucky!), it generates a new number guaranteed not to be the same as the first one.

BTW, your patch has lots of "undefined order of execution" issues, see here for more details: http://crca.ucsd.edu/~msp/Pd_documentation/x2.htm#s3.2

http://www.pdpatchrepo.info/hurleur/random-that-does-not-repeat.pd

thanks, i'll try and get my head around it tonight.

Nice stuff chaps.

Claudes patch in words:

Generate a random number R in range 0 to n, output it, and store it
Generate a new random number R in range 0 to n, and compare it to the stored number
If they are non-equal output R, and store it
else generate a new random number S = R+(1+(n-1)) mod n, output S and store it

Did I see that right Claude?

These are musically useful. Another good one is [urn]. That gives unique random numbers from 0 to n, so each of 0, 1, 2 ... n appears only once during any sequence of n bangs. In other words a permutation (reordering) of 0 through n

I think i get the "order of execution" now.
Although i understand its flaw, i've attempted to rebuild my patch with correct execution order.

Next up is trying to figure out the S = R+(1+(n-1)) in Clauds patch.

http://www.pdpatchrepo.info/hurleur/monkeyRan.pd

Gret, it looks loads simpler with those feedback flows from an initial set of conditions.

While the fault is theoretical, Claude is being strict and correct, for small random numbers (0-50) the chances of a long run causing a delay are small (and an infinite run somewhat smaller Perhaps the patch should come with a warning like one of these.
http://www.goshen.edu/~calvinfs/humor/physwarn.htm

PS thanks for all the insightful help steering the Amsterdam workshop last weekend.

No worries! Thanks for coming over.

I'll keep an eye on mediamatic. Hopefully there will be more workshops like these in the future.