[R] Automated generation of combinations

[Dimitris Rizopoulos]

one option is the following:

varNames <- c("varA", "varB", "varC", "varD")

f <- function (i) {
     combn(length(varNames), i,
         function (x) paste(varNames[x], collapse = " + "))
}
lapply(seq_along(varNames), f)


However, in case you're interested in performing a linear regression 
with these subsets, then have also a look at package leaps 
(http://CRAN.R-project.org/package=leaps).

Best,
Dimitris


On 9/12/2011 11:20 AM, Santiago Guallar wrote:
> Hello,
>
> I'd like to generate automatically all the possible combinations of a set of 8 variables (there are 535, too many to do it by hand). For example:
>
> input: varA, varB, varC
> output: varA+varB+varC
>              varA+varB
>              varA+varC
>              varB+varC
>              varA
>              varB
>              varC
> Is there any function that produces this option?
>
> Thank you
> 	[[alternative HTML version deleted]]
>
>
>
>
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-- 
Dimitris Rizopoulos
Assistant Professor
Department of Biostatistics
Erasmus University Medical Center

Address: PO Box 2040, 3000 CA Rotterdam, the Netherlands
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