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% File src/library/base/man/col.Rd
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% File src/library/base/man/col.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 1995-2017 R Core Team
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% Copyright 1995-2018 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{col}
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\name{col}
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\title{Column Indexes}
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\title{Column Indexes}
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\alias{col}
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\alias{col}
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.col(dim)
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.col(dim)
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}
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}
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\arguments{
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\arguments{
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  \item{x}{a matrix-like object, that is one with a two-dimensional
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  \item{x}{a matrix-like object, that is one with a two-dimensional
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    \code{dim}.}
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    \code{dim}.}
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  \item{dim}{a matrix dimension, i.e., \code{\link{integer}} vector of
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  \item{dim}{a matrix dimension, i.e., an integer valued numeric vector of
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    length two (with non-negative entries).}
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    length two (with non-negative entries).}
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  \item{as.factor}{a logical value indicating whether the value should
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  \item{as.factor}{a logical value indicating whether the value should
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    be returned as a factor of column labels (created if necessary)
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    be returned as a factor of column labels (created if necessary)
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    rather than as numbers.}
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    rather than as numbers.}
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}
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}
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ma[row(ma) == col(ma) + 1]
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ma[row(ma) == col(ma) + 1]
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# create an identity 5-by-5 matrix more slowly than diag(n = 5):
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# create an identity 5-by-5 matrix more slowly than diag(n = 5):
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x <- matrix(0, nrow = 5, ncol = 5)
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x <- matrix(0, nrow = 5, ncol = 5)
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x[row(x) == col(x)] <- 1
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x[row(x) == col(x)] <- 1
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(i34 <- .col(3:4))
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stopifnot(identical(i34, .col(c(3,4)))) # 'dim' maybe "double"
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}
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}
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\keyword{array}
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\keyword{array}