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

From: Moshe Olshansky <m_olshansky_at_yahoo.com>
Date: Tue, 29 Jul 2008 15:21:58 -0700 (PDT)


Try

abs(outer(xk,x,"-"))

(see ?outer)

> From: dxc13 <dxc13_at_health.state.ny.us>
> Subject: [R] finding a faster way to do an iterative computation
> To: r-help@r-project.org
> Received: Wednesday, 30 July, 2008, 4:12 AM
> 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
> --
> View this message in context:
> http://www.nabble.com/finding-a-faster-way-to-do-an-iterative-computation-tp18718233p18718233.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
> R-help_at_r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained,
> reproducible code.



R-help_at_r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. Received on Tue 29 Jul 2008 - 22:33:38 GMT

Archive maintained by Robert King, hosted by the discipline of statistics at the University of Newcastle, Australia.
Archive generated by hypermail 2.2.0, at Tue 29 Jul 2008 - 23:32:55 GMT.

Mailing list information is available at https://stat.ethz.ch/mailman/listinfo/r-help. Please read the posting guide before posting to the list.

list of date sections of archive