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August 2006

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Subject:
Re: How to pick a random GPIndividual as opponent?
From:
Sean Luke <[log in to unmask]>
Reply To:
ECJ Evolutionary Computation Toolkit <[log in to unmask]>
Date:
Mon, 21 Aug 2006 11:05:35 +0900
Content-Type:
text/plain
Parts/Attachments:
text/plain (26 lines) 
If you mean to select a random individual from the population, and  

you only have one subpopulation, then you just go into the  

subpopulation's individuals array and grab one.  Something along the  

lines of:



int numInds = state.population.subpops[0].individuals.length;

int randomIndex = state.random[thread].nextInt(numInds);

GPIndividual opponent = (GPIndividual)(state.population.subpops 

[0].individuals[randomIndex]);



On Aug 21, 2006, at 5:13 AM, Robert Baruch wrote:



> Hi all,

>

> I'm using ECJ 15. I'm having a difficult time finding an API  

> accessible through GPProblem.evaluate

> that will let me pick a random opponent individual to play against  

> the current individual under

> evaluation.

>

> Any ideas?

>

> Thanks!

>

> --Rob

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