Dear R community,
I am using function 'within' in R.2.9.1 to add variables to an existing
data.frame. This works wonderful, except for one minor point: The new variables
are added to the data in reverse order.
For example:
x <- data.frame(a = 1:3, b = 4:6)
y <- within(x, {
c = a^2
d = b^2
e = c+d
}
)
gives
a b e d c
1 1 4 17 16 1
2 2 5 29 25 4
3 3 6 45 36 9
Just what I want; except that I would prefer the columns to be in order
a,b,c,d,e instead.
I could use transform ("transform(x, c=a^2, d=b^2, e=c+d)"), which preserves
the specified order of variables, but that won't work here because
unfortunately it doesn't find object 'd' (same with "within(x, {e = c+d; d =
b^2; c = a^2})", by the way).
Of course in my toy example I can easily do something like y[, c(1:2,5:3)]
afterwards, but I'd like to ask if maybe there is a simple way to make 'within'
preserve the order of specified variables (or maybe someone can shed light on
why this is not possible?).
Thanks,
Heinrich.
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