[Rd] Test for argument in ...
Gregor Gorjanc
gregor.gorjanc at gmail.com
Sun Jul 2 03:00:33 CEST 2006
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.
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