David Pain wrote: > Trying out an unfamiliar package, the natural thing is to use the examples > given in the package's manual - hopefully, the writers of the package > wouldn't include examples which didn't work! > > Recently, though, I've been getting 'unexpected$undefined' error messages > when doing this, despite having copy/pasted the text from the manual (taking > out hard breaks on the way). > > Moreover, I've had error messages for commands which I've previously had > work fine. > > For instance, this from Zelig > > z.out < zelig(vote ~ race + educate, model = "logit", data = turnout) > > has at different times worked fine and thrown up the error message. > > Any help gratefully received. > > [[alternative HTML version deleted]] It's hard to say exactly what's going wrong, but a guess is that in your workspace you have an object which is somehow conflicting with an object in the package. Try starting R with the --vanilla command line option and if the errors go away, that's why.
I don't know whether this applies to the Zelig package, but packages that don't define namespaces are fragile in that their internal functions can be masked by same-named functions in your workspace. Even if the package does have a namespace, you can mask functions from it that you call: for example, if you had a function called zelig (perhaps because you used fix(zelig) to make a small change to the existing one), your line above would call yours, not the original. Duncan Murdoch ______________________________________________ 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 and provide commented, minimal, self-contained, reproducible code.
