R help - Mar 2011 - Question regarding vector manipulation

I have a question regarding the most efficient way to select a substring 
of a vector:

I have a vector of value v, and I want to select a subspace of this 
vector called w such that:

w=v[1:n]

where

sum(w) = x

I am interested in what you thing would be the most efficient way to do 
this - I would like to avoid slowing down my simulations as much as 
possible.

Thank you very much for any help that anyone is able to give.



Ben Hartley




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