[R] R loop problem

[testrider]

I have run into a speed issue, and given the size of the problem it feels
like there should be an easy solution. Here is the problem statement with
some arbitrary numbers added.

#p,q: vector with length(q)==length(p)==10000 and length(levels(p))==3000
#y,z: vectors with length(levels(y))=length(y)==length(z)==5000

for (i in levels(p)){
q[i==p]<-z[i==y]}

At first i used two for loops which was horrible, now i got rid of one but i
don't know how to lose the second one.


PS. I expect the solution to be available through google etc and I have
searched for a solution but i did not find any usefull websites, probably
because i cannot pinpoint the best search words.

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