On 07/02/2016 7:14 PM, Ben Tupper wrote:
Hi,
On Feb 7, 2016, at 6:24 PM, Duncan Murdoch <murdoch.dun...@gmail.com> wrote:
On 07/02/2016 6:12 PM, Robert Sherry wrote:
I would like to write a function in R that would take a variable number
of integers as parameters. I do not have a pressing reason to do this, I
am just trying to learn R. I thought a good first step would be to print
out the arguments. So I wrote the following function:
f1 = function (...)
{
list1 = as.list(...)
This is wrong. The ... object is weird; it's not something that can be coerced
to a list. However, you can pass it as list(...) and it will give you what you
were expecting.
Do you mean that Bob should nest a function within f1? Like this?
No need for that. His original function would work if he had used
list(...) instead of as.list(...).
Duncan Murdoch
f1 = function (...){
f2 <- function(list1){
for( i in 1:length(list1) ) cat( "i is ", list1[[i]], "\n" )
return (0)
}
f2(list(...))
}
f1(2,4,10,12)
f1(2,4,10,12)
i is 2
i is 4
i is 10
i is 12
Ben
The theory is that it will expand to multiple arguments to the list() function,
which constructs a list containing them. as.list() doesn't want a bunch of
arguments, it will just ignore most of them.
Duncan Murdoch
for( i in 1:length(list1) )
cat( "i is ", list1[[i]], "\n" )
return (0)
}
I ran it as:
f1(2,4,10,12)
and I get:
i is 2
[1] 0
I was hoping for
i is 2
i is 4
i is 10
i is 12
I am hoping somebody can tell me what I am doing wrong. Is using a list
a bad idea?
Thanks
Bob
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______________________________________________
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
Ben Tupper
Bigelow Laboratory for Ocean Sciences
60 Bigelow Drive, P.O. Box 380
East Boothbay, Maine 04544
http://www.bigelow.org
______________________________________________
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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.
______________________________________________
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.
