[Rd] Evaluation puzzle

Gabor Grothendieck ggrothendieck at gmail.com
Thu Nov 11 23:31:31 CET 2010

On Thu, Nov 11, 2010 at 5:27 PM, Terry Therneau <therneau at mayo.edu> wrote:
> Gabor wrote:
>  At the above statement you have lost the environment of your formula.
>>    m$formula <- tform
> Replace this with:
> m$formula <- as.formula(tform, environment(formula))
> ----------------------
>  No, I have not "lost" an environment.  I manufactured a formula which

You manufactured a "character" string, not a "formula", and character
strings don't have environments.

> lacked something needed, but without the necessary hint that I needed
> it. But that is semantics:  A closer reread of help(model.frame) shows
> that the documentation is there, I had missed it.
>  I'm still puzzled by recover though.
> Terry T.

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