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