On Nov 19, 2009, at 9:28 PM, Yihui Xie wrote:
Hi all,
Suppose I have a formula: a = log(y) ~ x1 + I(x2^2)
How can I extract the original variable names 'y', 'x1', 'x2' from
this formula? Thanks a lot!
Regards,
Yihui
> all.vars(a)
[1] "y" "x1" "x2"
See ?all.vars
HTH,
Marc Schwartz
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