[Rd] How to loop through a set of data and to evaluate a function?

[NicoNYC]

Hi,
I will explain my problem :
I would like to loop through a set of data taking the set 100 points at a
time.  At each iteration I'd like to evaluate a function over this set.  In
each subsequent iteration i add the next point to my sub set and remove the
oldest and evaluate the function again (something like a moving window).

Small example : this is my data:
1
2
3
..
10

with a moving window of 3 points, i would like to evaluate the following
f(1,2,3)
f(2,3,4)
f(3.4.5)
...
f(8,9,10)

Thank you!
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