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% File src/library/base/man/which.Rd
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% File src/library/base/man/which.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 1995-2018 R Core Team
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% Copyright 1995-2019 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{which}
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\name{which}
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\alias{which}
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\alias{which}
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\alias{arrayInd}
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\alias{arrayInd}
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   column names.  \code{.dimnames[[1]]} is used as row names.}
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   column names.  \code{.dimnames[[1]]} is used as row names.}
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 \item{useNames}{logical indicating if the value of \code{arrayInd()}
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 \item{useNames}{logical indicating if the value of \code{arrayInd()}
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   should have (non-null) dimnames at all.}
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   should have (non-null) dimnames at all.}
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}
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}
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\value{
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\value{
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  If \code{arr.ind == FALSE} (the default), an integer vector with
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  If \code{arr.ind == FALSE} (the default), an integer vector,
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  or a double vector if \code{x} is a \emph{long vector}, with
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  \code{length} equal to \code{sum(x)}, i.e., to the number of
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  \code{length} equal to \code{sum(x)}, i.e., to the number of
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  \code{TRUE}s in \code{x}.
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  \code{TRUE}s in \code{x}.
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  Basically, the result is \code{(1:length(x))[x]} in typical cases;
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  Basically, the result is \code{(1:length(x))[x]} in typical cases;
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  more generally, including when \code{x} has \code{\link{NA}}'s,
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  more generally, including when \code{x} has \code{\link{NA}}'s,