On Feb 10, 2011, at 12:24 AM, Ramya wrote:
hi there,
I need to subtract each value in the dataframe from the mean of the
column
and divide by the
standard deviation of the column.
dim(a)
[1] 22011 52
data2 <- sapply(seq(from = 2, by = 1, length = 50), function(e){
rbind((a[[e]] - mean(a[,e]))/sd(a[,e]))
})
Does this look right????
It looks like the "hard way" ( and it's not clear why one would need
rbind, either):
?scale
scale(a)
Any help would be appreciated.
Thanks
RT
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