> On May 29, 2017, at 1:16 PM, Duncan Murdoch <murdoch.dun...@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
>
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David Winsemius
Alameda, CA, USA
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