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

[Christos Hatzis]

matrix(rep(x, each=13) - xk, nrow=13) 

> -----Original Message-----
> From: r-help-bounces at r-project.org 
> [mailto:r-help-bounces at r-project.org] On Behalf Of dxc13
> Sent: Tuesday, July 29, 2008 2:13 PM
> To: r-help at r-project.org
> Subject: [R] finding a faster way to do an iterative computation
> 
> 
> useR's,
> 
> 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,
> dxc13
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> computation-tp18718233p18718233.html
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