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Topic: Multiple independent random number streams cannot be implemented.
Replies: 3   Last Post: Mar 16, 2013 3:13 AM

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Roger Wilson

Posts: 16
Registered: 10/23/10
Multiple independent random number streams cannot be implemented.
Posted: Mar 14, 2013 7:13 AM
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Hopefully the title is enough of a red flag for someone to try to prove me wrong.

I want to implement two functions; lets call them f and g so that they both return random numbers. For example...

f[]:=RandomReal[];
g[]:=RandomReal[];

However I want f and g to return the same number when they're called for the nth time. So the first call to f is always the same number and the first call to g is always the same number.

In the above case (on my machine)...
SeedRandom[1]; {f[], g[]} gives {0.168697, 0.113119}

and of course..
SeedRandom[1]; {g[], f[]} gives the same {0.817389, 0.11142}

Essentially I want f and g to to be independent random sources.

It is possible to localize the random number generators using BlockRandom but I do not see how that helps me in this case. BlockRandom localizes the state of the random number generators within the block where as I want to localize them into the symbol names.

Roger




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