Re: [R] passing formula arg to mgcv::gam

[Thomas Lumley]

I think that this should work in gam(), but in any case a fix is to put 
the subset variable into the data frame.  The formula interface works best 
this way.  In your example you could add idx=1:100 to the data frame and 
then use subset=idx %in%  1:10

        -thomas
On Mon, 27 Sep 2004, Vadim Ogranovich wrote:
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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Thomas Lumley                       Assoc. Professor, Biostatistics
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