[R] Rescaling a column in a matrix based on a certain rows

From: Anh Tran <popophobia_at_gmail.com>
Date: Fri, 09 May 2008 12:51:45 -0700

Let say I have this matrix:

> mat<-matrix(cbind(rnorm(20),rnorm(20)), ncol = 2)

And I want to rescale values of column [,1] and [,2] using values from row 1 to 5, such that the values of row 1:5 should be rescale to the same amplitude (kinda like take the z-score of population from row 1:5). column 1 and 2 are two different samples need to be compared.

I hope I made myself clear enough. thanks for any help

UCLA Neurology Research

Anh Tran

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