From: Christoph Lehmann <christoph.lehmann_at_gmx.ch>

Date: Tue 20 Jul 2004 - 19:31:04 EST

}

R-help@stat.math.ethz.ch mailing list

https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Tue Jul 20 19:44:35 2004

Date: Tue 20 Jul 2004 - 19:31:04 EST

say, e.g. I want to z-transform the data (subtract the mean and divide by the std-deviation)

for (x in 1:x.dim) { for (y in 1:y.dim) { t <- as.matrix(my.matrix[x,y,slice,1:volumes]) for (vol in 1:volumes) { my.matrix.transformed[x,y,slice,vol] <- (my.matrix[x,y,slice,vol] - mean(t))/sqrt(var(t)) } } }

}

how can I vectorize such a function using, one of the *apply functions?

many thanks

Cheers

Christoph

R-help@stat.math.ethz.ch mailing list

https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Tue Jul 20 19:44:35 2004

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