[R] R loop help

[casperyc]

Hi there,

That's exactly what I want.

I have checked ?combn out,
but I could get the following,

suppose that I want ALL possible combinations of them,
as this

==================================
apply(
	combn(paste('x', 1:4, sep =""), 2), 2,
        function(v) get(v[1])*get(v[2])
	),
apply(
	combn(paste('x', 1:4, sep =""), 3), 2,
        function(v) get(v[1])*get(v[2])*get(v[3])
	),
apply(
	combn(paste('x', 1:4, sep =""), 4), 2,
        function(v) get(v[1])*get(v[2])*get(v[3])*get(v[4])
	)
)
==================================

combn(paste('x', 1:4, sep =""), 2) 
lists all the '2' factor combinations,
combn(paste('x', 1:4, sep =""),3)
lists all the '3' factor combinations,
ect,

I have tried to use
combn(paste('x', 1:4, sep =""), c(2,3,4))
to get all possible combinations, 
but didnt work

how should I proceed?

Thanks!

casper
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