Java :: Generate A Weighted Random Number?

Dec 8, 2011

I'm trying to devise a (good) way to choose a random number from a range of possible numbers where each number in the range is given a weight. To put it simply: given the range of numbers (0,1,2) choose a number where 0 has an 80% probability of being selected, 1 has a 10% chance and 2 has a 10% chance.

It's been about 8 years since my college stats class, so you can imagine the proper formula for this escapes me at the moment.

Here's the 'cheap and dirty' method that I came up with. This solution uses ColdFusion. Yours may use whatever language you'd like. I'm a programmer, I think I can handle porting it. Ultimately my solution needs to be in Groovy - I wrote this one in ColdFusion because it's easy to quickly write/test in CF.

public function weightedRandom( Struct options ) {
var tempArr = [];
for( var o in arguments.options )

[Code]....

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