[R] calling pairs of variables into a function

[rex.dwyer at syngenta.com]

Try putting d,e,f in a list:
Xxx = list(d,e,f)

For (I in 1:length(xxx))
For (j in 1:length(xxx))
If (i!=j) bigfunction(xxx[[i]],xxx[[j]])

(bad indentation, caps thanks to outlook)


-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf Of squamous
Sent: Wednesday, February 16, 2011 7:11 PM
To: r-help at r-project.org
Subject: [R] calling pairs of variables into a function


Hi,
I have imported three text files into R using read.table.  Their variables
are called d, e and f.

I want to run a function on all the possible combinations of these three
files.  The only way I know how to do that is like this:

bigfunction(d,e)
bigfunction(d,f)
bigfunction(e,d)
bigfunction(e,f)
bigfunction(f,e)
bigfunction(f,d)

Is there an easier way?  I will have five files later on, so it would be
useful to know!  I'd imagine I can use a loop somehow, and I have installed
a package (gregmisc) so that typing permutations(3,2) gives all the possible
pairs of three numbers, but I don't know how to combine these things to make
it work.
--
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