From: Sebastian Hungerecker <sepp2k@...>
Date: 2007-12-26T18:41:16+09:00
Subject: Re: Index of the n-th occurrence

Marco wrote:
> 2) What's the simplest way to select elements of a vector,on the basis of a
> condition on a second vector of the same length?

res=[]
[1,2,3,4].zip([2,4,9,16]) {|x,y| res << x if y==x*2}
res #=> [1,2]


HTH,
Sebastian
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