[R] Usefulness of "scale" function

Gundala Viswanath gundalav at gmail.com
Sat Jun 7 16:41:04 CEST 2008

Hi all,

I found this snippet in a gene expression
clustering code.

temp <- readLines("GSE1110_series_matrix.txt");
cat(temp[-grep("^!|^\"$", temp)], file="GSE1110clean.txt", sep="\n");
mydata <- read.delim("GSE1110clean.txt", header=T, sep="\t")

mydatascale <- t(scale(t(mydata)))

I am wondering, in general:

1. What is the purpose of 'scale' function?
2. When one should use it?

Gundala Viswanath

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