[R] finding a faster way to do an iterative computation

dxc13 dxc13 at health.state.ny.us
Tue Jul 29 20:12:55 CEST 2008


I am trying trying to find out if there is a faster way to do a certain
computation.  I have successfully used FOR loops and the apply function to
do this, but it can take some time to fully compute, but I was wondering if
anyone may know of a different function or way to do this:
> x
[1] 1 2 3 4 5
> xk
 [1] 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0

I want to do: abs(x-xk[i]) where i = 1 to length(xk)=13.  It should result
in a 13 by 5 matrix or data frame.  Does anyone have a "quicker" solution
than FOR loops or apply()?

Much appreciation and thanks,
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