[R-pkg-devel] Determine subset from glm object

I need to find out from an object returned by R function glm with argument
x = TRUE
what the subsetting was.  It appears that if gout is that object, then

as.integer(rownames(gout$x))

is a subset vector equivalent to the one actually used.

I do also have the call to glm (as a call object) so can determine the
actual subset argument, but this seems to be not so useful because I don't
know the length of the original variables before subsetting.

So now my questions.  Is this idea above (using rownames) OK even though I
cannot find where (if anywhere) it is documented?  Is there a better way?
One more guaranteed to be correct in the future?

Charles Geyer
Professor, School of Statistics
Resident Fellow, Minnesota Center for Philosophy of Science
University of Minnesota
charlie at stat.umn.edu

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