Hi,
Gabor Grothendieck wrote:
> Try this:
>
>> f <- function(...) if (!is.null(list(...)$arg1)) cat("arg1 found\n")
>> else cat("arg1 not found\n")
>> f(arg1 = 3)
> arg1 found
>> f(arg2 = 3)
> arg1 not found
Actually it is not OK. Bellow is simplified example that shows, what I
would like to do:
foo1 <- function(x, ...)
{
if(is.null(list(...)$decreasing)) {
decreasing <- TRUE
} else {
decreasing <- list(...)$decreasing
}
return(order(x, ..., decreasing=decreasing))
}
> foo1(c(5, 2, 3, 4))
[1] 1 4 3 2
>foo1(c(5, 2, 3, 4), decreasing=FALSE)
Error in order(x, ..., decreasing = decreasing) :
formal argument "decreasing" matched by multiple actual arguments
> On 7/1/06, Gregor Gorjanc <[EMAIL PROTECTED]> wrote:
>> Hello!
>>
>> Say I have a function foo1, which has argument ... to pass various
>> arguments to foo2 i.e.
>>
>> foo1 <- function(x, ...)
>> {
>> foo2(x, ...)
>> }
>>
>> Say that foo2 accepts argument arg1 and I would like to do the following:
>> - if foo1 is called as foo1(x) then I would like to assign some value to
>> arg1 inside foo1 before calling foo2
>>
>> arg1 <- "some value"
>> foo2(x, arg1=arg1)
>>
>> - if foo1 is called foo1(arg1="some other value") do not assign some
>> value to arg1 and call foo2
>>
>> foo2(arg1=arg1)
>>
>> However, I am not able to do this since I do not know how to test/check
>> if arg1 was given in foo1. Is it possible to test whether some argument
>> was passed in "..." i.e. something like
>>
>> foo1 <- function(x, ...)
>> {
>> if(testForArgumentInThreeDots(arg1)) arg1 <- "some value"
>> foo2(x, arg1=arg1, ...)
>> }
>>
>> Thanks!
>>
>> --
>> Lep pozdrav / With regards,
>> Gregor Gorjanc
>>
>> ----------------------------------------------------------------------
>> University of Ljubljana PhD student
>> Biotechnical Faculty
>> Zootechnical Department URI: http://www.bfro.uni-lj.si/MR/ggorjan
>> Groblje 3 mail: gregor.gorjanc <at> bfro.uni-lj.si
>>
>> SI-1230 Domzale tel: +386 (0)1 72 17 861
>> Slovenia, Europe fax: +386 (0)1 72 17 888
>>
>> ----------------------------------------------------------------------
>> "One must learn by doing the thing; for though you think you know it,
>> you have no certainty until you try." Sophocles ~ 450 B.C.
>>
>> ______________________________________________
>> R-devel@r-project.org mailing list
>> https://stat.ethz.ch/mailman/listinfo/r-devel
>>
--
Lep pozdrav / With regards,
Gregor Gorjanc
----------------------------------------------------------------------
University of Ljubljana PhD student
Biotechnical Faculty
Zootechnical Department URI: http://www.bfro.uni-lj.si/MR/ggorjan
Groblje 3 mail: gregor.gorjanc <at> bfro.uni-lj.si
SI-1230 Domzale tel: +386 (0)1 72 17 861
Slovenia, Europe fax: +386 (0)1 72 17 888
----------------------------------------------------------------------
"One must learn by doing the thing; for though you think you know it,
you have no certainty until you try." Sophocles ~ 450 B.C.
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