vector indexing

Hi,

I got a small problem on how to define the vector index without manually
inspect the vector.

example:

y=c(2,3,5,2,4,6,8,3,6,2,5) #I have ten set of this kind of vectors (with
different values but same length) that I would also like to run the routine
below

#say;
v=the first index in y where the value is larger than 4, in this case index
3, value 5

#what I would like to do is take y[1:v] and run it to some function
#hence I should also get y[(v+1),length(y)] and can run to other function
as well..

I know this is easy peasy for you..please help, many thanks.

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