Well... ?terms.formula says:
"data: a data frame from which the meaning of the special symbol . can be inferred. It is unused if there is no . in the formula." So this seems to me to be an obscure bug, as I have found no warning against this admittedly confusing but still, I think, legal syntax. Note: > d <- data.frame(log = runif(10), x = 1:10) > y <- rnorm(10,5) > m1 <- lm(y ~ ., data = d) > formula(m1) y ~ log + x > m2 <- update(m1, formula =log(y) ~.) > formula(m2) log(y) ~ log + x > m3 = lm(log(y) ~., data =d) > formula(m3) log(y) ~ x As always, correction appreciated if I'm wrong. Cheers, Bert Bert Gunter "The trouble with having an open mind is that people keep coming along and sticking things into it." -- Opus (aka Berkeley Breathed in his "Bloom County" comic strip ) On Tue, Jan 30, 2018 at 6:23 AM, Jeff Newmiller <jdnew...@dcn.davis.ca.us> wrote: > > Functions are first class objects, so some kind of collision is bound to > happen if you do this... so don't. > -- > Sent from my phone. Please excuse my brevity. > > On January 30, 2018 3:11:56 AM PST, "Vito M. R. Muggeo" > <vito.mug...@unipa.it> wrote: > >dear all, > >Is the following intentional? Am I missing anything in documentation? > > > >d<-data.frame(y=rnorm(10,5,.5),exp=rnorm(10), age=rnorm(10)) > >formula(lm(exp(y)~exp+age, data=d)) > >#--> exp(y) ~ exp + age > > > >formula(lm(exp(y)~., data=d)) > >#--> exp(y) ~ age > > > >variable 'exp' (maybe indicating "experience") is not included in the > >model. The same happens with 'log' (and other function names, I > >suppose..) > > > >best, > >vito > > ______________________________________________ > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > 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. ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.
