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% File src/library/utils/man/combn.Rd
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% File src/library/utils/man/combn.Rd
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% Part of the R package, https://www.R-project.org
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% Part of the R package, https://www.R-project.org
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% Copyright 1995-2014 R Core Team
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% Copyright 1995-2017 R Core Team
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% Distributed under GPL 2 or later
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% Distributed under GPL 2 or later
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\name{combn}
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\name{combn}
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\alias{combn}
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\alias{combn}
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\title{Generate All Combinations of n Elements, Taken m at a Time}
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\title{Generate All Combinations of n Elements, Taken m at a Time}
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    efficiency reasons).  This will badly fail if \code{FUN(u)} is not of
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    efficiency reasons).  This will badly fail if \code{FUN(u)} is not of
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    constant length.}
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    constant length.}
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  \item{\dots}{optionally, further arguments to \code{FUN}.}
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  \item{\dots}{optionally, further arguments to \code{FUN}.}
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}
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}
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\details{
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\details{
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  Factors \code{x} are accepted from \R 3.1.0 (although coincidentally
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  Factors \code{x} are accepted.
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  they worked for \code{simplify = FALSE} in earlier versions).
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}
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}
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\value{
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\value{
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  a \code{\link{list}} or \code{\link{array}}, see the \code{simplify}
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  A \code{\link{list}} or \code{\link{array}}, see the \code{simplify}
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  argument above.  In the latter case, the identity
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  argument above.  In the latter case, the identity
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  \code{dim(combn(n, m)) == c(m, choose(n, m))} holds.
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  \code{dim(combn(n, m)) == c(m, choose(n, m))} holds.
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}
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}
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\references{
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\references{
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  Nijenhuis, A. and Wilf, H.S. (1978)
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  Nijenhuis, A. and Wilf, H.S. (1978)