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List:       r-help
Subject:    Re: [R] get the value of a biplane
From:       David Winsemius <dwinsemius () comcast ! net>
Date:       2017-05-29 20:51:22
Message-ID: 778CDE1F-2000-4301-91CE-FBA14825DDB1 () comcast ! net
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> On May 29, 2017, at 1:16 PM, Duncan Murdoch <murdoch.duncan@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.

-- 
David.
> 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
> 
> ______________________________________________
> R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
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> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.

David Winsemius
Alameda, CA, USA

______________________________________________
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