Re: [R] removing for loop

From: Dimitris Rizopoulos <>
Date: Tue 04 Jul 2006 - 19:56:49 EST

try this:

m <- outer(b, b, "-")

I hope it helps.


Dimitris Rizopoulos
Ph.D. Student
Biostatistical Centre
School of Public Health
Catholic University of Leuven

Address: Kapucijnenvoer 35, Leuven, Belgium

Tel: +32/(0)16/336899
Fax: +32/(0)16/337015

> 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];
> (where m is a NxN matrix and b a vector of length N)
> Thanks for any hint.
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Disclaimer: mailing list PLEASE do read the posting guide! Received on Tue Jul 04 20:09:27 2006

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