[datatable-help] setnames on copy data.table also renames original data.table object

[Manabu Sakamoto]

Dear list,

I have a data.table object for instance DT:

x <- seq(1:100)
y <- x^2
DT <- data.table(X=x, Y=y)

and I produce a copy

DT2 <- DT

which I rename

setnames(DT2, c("A","B"))

this somehow also renames DT, the names of which are now "A" and "B".

How can I just rename the copy and keep the names of the original?

Many thanks,
Manabu

-- 
Manabu Sakamoto, PhD
manabu.sakamoto at gmail.com
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