roulette-wheel-selection

My question is linked with this one: Roulette-wheel selection in Genetic algorithm. Population needs to be sorted first? If we don't sort the population what is the way of organizing roulette wheel selection for it? Surely, we have to search in linear way now. Have you got any code snippets in C++ or Java for this case? The population does not need to be sorted at all - the key to roulette selection is that the probability of a given individual being selected for reproduction is proportional to its fitness. Say you have an unsorted population, with fitnesses as follows: [12, 45, 76, 32, 54, 21

Could somebody explain to me the architecture behind chatroulette? I was thinking about a similar project that would only implement Audio support (for starters). Is the best way to set this up a flash server? If so, how should I go about getting into flash, will I need flex 4? I have some beginner experience with c++, c# and java but I have never developed anything for the web. I was also wondering how the randomizer matches up the participants. How would you code something like this. Im obviously pretty clueless here and I'd greatly appreciate some advice regarding this problem -- I don't

Can anyone provide some pseudo code for a roulette selection function? How would I implement this: I don't really understand how to read this math notation. I never took any probability or statistics. Jarod Elliott It's been a few years since i've done this myself, however the following pseudo code was found easily enough on google. for all members of population sum += fitness of this individual end for for all members of population probability = sum of probabilities + (fitness / sum) sum of probabilities += probability end for loop until new population is full do this twice number = Random

This question already has an answer here: Roulette Selection in Genetic Algorithms 13 answers Can anyone provide some pseudo code for a roulette selection function? How would I implement this: I don't really understand how to read this math notation.I want General algorithm to this. The other answers seem to be assuming that you are trying to implement a roulette game. I think that you are asking about roulette wheel selection in evolutionary algorithms. Here is some Java code that implements roulette wheel selection. Assume you have 10 items to choose from and you choose by generating a