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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