Re: [R] removing for loop

From: Uwe Ligges <ligges_at_statistik.uni-dortmund.de>
Date: Tue 04 Jul 2006 - 19:52:49 EST

vincent@7d4.com wrote:
> Dear Rusers,
>
> Trying to reduce my for loops addiction,
> could somebody tell me if there are ways to simplify
> (and perhaps accelerate ?) the following line
>
> for (i in 1:N) for (j in 1:N) m[i,j] = b[i]-b[j];

outer(b, b, "-")

Uwe Ligges

> (where m is a NxN matrix and b a vector of length N)
>
> Thanks for any hint.
>
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https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Tue Jul 04 21:16:30 2006

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