[Rd] Suggestions for manipulating formula objects

[Thomas Lumley]

On Wed, 20 Apr 2005 rlee at fpcc.net wrote:

> I'm trying to manipulate/change a formula prior to passing it to another
> function.  A simplified example:
>
> User passes formula to my function: y~x
> My function does: lm(transform(y)~x)
>
> Here, transform() is added to the model's response.
>
> What is the best way to accomplish this?

One way is

formula[[2]]<-substitute(transform(y),list(y=formula[[2]]))


 	-thomas