From: Vadim Ogranovich <vograno_at_evafunds.com>

Date: Tue 28 Sep 2004 - 08:57:43 EST

R-help@stat.math.ethz.ch mailing list

https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Tue Sep 28 09:07:57 2004

Date: Tue 28 Sep 2004 - 08:57:43 EST

This is a self-response :-).

It was indeed a problem with environments. One way to get around is to "reset" the environment, e.g. inside callGam do formula <- as.formula(unclass(formula))

Not too aesthetic, but works. Is there a less kludgy way to do this?

BTW, forgot to mention. This is R-1.9.1 on RH-7.3.

Thanks,

Vadim

*> -----Original Message-----
**> From: r-help-bounces@stat.math.ethz.ch
*

> [mailto:r-help-bounces@stat.math.ethz.ch] On Behalf Of Vadim

*> Ogranovich
**> Sent: Monday, September 27, 2004 3:24 PM
**> To: r-help@stat.math.ethz.ch
**> Subject: [R] passing formula arg to mgcv::gam
**>
**> Hi,
**>
**> I have a function, callGam, that fits a gam model to a subset
**> of a dataframe. The argument to callGam is a formula, the
**> subset is determined inside the function itself. My naïve
**> approach generates and error, see below. I guess this is
**> because 'idx' is loocked up in the environment of 'formula',
**> but I am too ignorant about environments to be able to tell
**> for sure. Could someone please suggest a way around?
**>
**> Thanks,
**> Vadim
**>
**> > library("mgcv")
**> >
**> > callGam <- function(formula) {
**> + idx <- seq(10)
**> + gam(formula, data=data.frame(x=rnorm(100), y=rnorm(100)),
**> + subset=idx) }
**> >
**> > gam.fit <- callGam(y ~ x)
**> Error in eval(expr, envir, enclos) : Object "idx" not found
**> >
**>
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>

R-help@stat.math.ethz.ch mailing list

https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Tue Sep 28 09:07:57 2004

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