[R] get the value of a biplane

David Winsemius dwinsemius at comcast.net
Mon May 29 22:51:22 CEST 2017

> On May 29, 2017, at 1:16 PM, Duncan Murdoch <murdoch.duncan at gmail.com> wrote:
> On 29/05/2017 3:15 PM, Jeff Newmiller wrote:
>> Well, then I will hedge by saying that IN MY OPINION it is an error, because when it isn't exported the arguments not specified in the generic cannot be visible for argument completion in editors.
> But that's not true.  If you want the arguments , use
> args(getS3method("predict", class(x)))
> where x is your bs() object.  RStudio appears to make use of something like this.  R.app on MacOS and Rgui on Windows does something different, I think not as effectively.

I think R.app uses rcompgen {utils}. Fortunately a deficit in my aging memory was filled in because typing `?completion` brought up the correct help page. I was not so lucky in trying to find reference to that function in the R for MacOS FAQ.

> I don't know about other editors.
> (BTW, I think the getS3method function has a bug:  if you change the x object to have class c("foobar", class(x)), it *does* fail, even though predict(x, ...)  will still work.)
> The predict.lm function specifies new data with the newdata argument, while the predict.bs function specifies it with the newx argument. Invoking with the generic is supposed be useful when trying out a variety of models, but being unable to generically specify a data frame (due to the inconsistent naming) blows that strategy to pieces anyway so you might as well be able to call the functions explicitly.
> In RStudio, if you set x <- bs(1:10), then type
> predict(x,
> and hit TAB, you are offered "object", "newx" and "..." as choices.  On the other editors I mentioned you appear to get a list of argument names for all possible methods regardless of the class of x.
> Duncan murdoch
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David Winsemius
Alameda, CA, USA

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