From: Chalasani, Prasad <prasad.chalasani_at_gs.com>

Date: Fri 20 May 2005 - 00:36:44 EST

https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Fri May 20 00:45:59 2005

Date: Fri 20 May 2005 - 00:36:44 EST

(a) When using "apply" row-wise to a matrix, it returns

the results column-wise, and to preserve the original orientation, I've to do a transpose. E.g. I've to keep doing a transpose, which I consider to be quite annoying.

transformed.mtx <- t(apply( mtx, 1, exp))

(b) When extracting 2 or more columns of a matrix,

Of course I could write a suitable function cols <- function(mtx,range) as.matrix(mtx[, range]) but then I lose the syntactic sugar of being able to say "[,1]". ______________________________________________R-help@stat.math.ethz.ch mailing list

https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Fri May 20 00:45:59 2005

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