On Sep 1, 2010, at 10:35 AM, Olga Lyashevska wrote:
Dear all,
I have a dataframe:
df<-dataframe(a=c(1,2,3),b=c(4,5,6),c=c(7,8,9),d=c(10,11,12))
I want to obtain a new dataframe with columns a and b being
standardized
((x-mean(x))/sd(x)); the other two columns (c,d) I want to leave
unchanged. What is the best way to achieve this? I have been trying to
use subscripts but did not succeed so far.
> df[ , 1:2] <- scale(df[ , 1:2])
> df
a b c d
1 -1 -1 7 10
2 0 0 8 11
3 1 1 9 12
--
David Winsemius, MD
West Hartford, CT
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