On 11/12/2015 1:52 PM, Mario José Marques-Azevedo wrote:
Hi Duncan and David,
Thank you for explanation. I'm really disappointed with this R "resource".
I think that partial match, mainly in function args, must be optional and
not default. We can have many problems and lost hours find errors (it occur
with me). I tried to find a solution to disable partial match, but it seems
that is not possible. Program with hacks for this will be sad.
Nowadays with smart editors, I agree that partial matching isn't really
necessary. However, R has been around for 20 years, and lots of
existing code depends on it. Eventually you'll get to know the quirks
of the design.
Duncan Murdoch
Best regards!
Mario
On 11 December 2015 at 15:55, David Winsemius <dwinsem...@comcast.net>
wrote:
>
> > On Dec 11, 2015, at 9:40 AM, Mario José Marques-Azevedo <
> mariojm...@gmail.com> wrote:
> >
> > Dears,
> >
> > I'm having a weird behaviours when setting arguments in functions.
> >
> > fn <- function(x, st="mean", b=NULL, col.range="black", ...){
> > dots <- list(...)
> > cat("col.range =", col.range, "\n")
> > cat("dots =\n")
> > print(dots)
> > }
> >
> > fn(1, b=2,col="red")
> >
> > # Output
> > col.range = red
>
> Argument matching is done with `pmatch`. So "col" is a partial match to
> "col.range".
>
> See ?match.arg
>
>
> > dots =
> > list()
> >
> > Why 'col' arguments are not in ellipses, but setting col.range to 'red'?
> >
> > If I change the position of ellipses
> >
> > fn2 <- function(x, ..., st="mean", b=NULL, col.range="black"){
> > dots <- list(...)
> > cat("col.range =", col.range, "\n")
> > cat("dots =\n")
> > print(dots)
> > }
> >
> > fn2(1, b=2, col="red")
> >
> > # Output
> > col.range = black
> > dots =
> > $col
> > [1] "red"
> >
> > It works! I'm using R version 3.2.2.
>
> It's been that way 'forever'.
>
> >
> > Best regards!
> >
> > Mario
> >
> > [[alternative HTML version deleted]]
> >
> > ______________________________________________
> > 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.
>
> David Winsemius
> Alameda, CA, USA
>
>
[[alternative HTML version deleted]]
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______________________________________________
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
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