[Rd] lm, weights and ...

[Gabor Grothendieck]

If you change it to:

lm3 <- function(...) eval.parent(substitute(lm(...)))

then it works.

> lm3(mpg ~ wt, weights=cyl, data=mtcars)

Call:
lm(formula = mpg ~ wt, data = mtcars, weights = cyl)

Coefficients:
(Intercept)           wt
      35.50        -4.91


On 9/3/06, hadley wickham <h.wickham at gmail.com> wrote:
> > lm2 <- function(...) lm(...)
> > lm2(mpg ~ wt, data=mtcars)
>
> Call:
> lm(formula = ..1, data = ..2)
>
> Coefficients:
> (Intercept)           wt
>     37.285       -5.344
>
> > lm2(mpg ~ wt, weights=cyl, data=mtcars)
> Error in eval(expr, envir, enclos) : ..2 used in an incorrect context,
> no ... to look in
>
>
> Can anyone explain why this is happening?  (Obviously this is a
> manufactured example, but it crops up in ggplot when you want to
> provide a function to perform smoothing)
>
> Thanks,
>
> Hadley
>
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