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% File src/library/base/man/matrix.Rd
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% File src/library/base/man/matrix.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 1995-2013 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{matrix}
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\name{matrix}
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\alias{matrix}
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\alias{matrix}
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\alias{as.matrix}
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\alias{as.matrix}
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\seealso{
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\seealso{
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  \code{\link{data.matrix}}, which attempts to convert to a numeric
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  \code{\link{data.matrix}}, which attempts to convert to a numeric
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  matrix.
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  matrix.
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  A matrix is the special case of a two-dimensional \code{\link{array}}.
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  A matrix is the special case of a two-dimensional \code{\link{array}}.
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  Currently, only if the environment variable  \code{"_R_CLASS_MATRIX_ARRAY_"} is set to a
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  non-empty string, i.e., \code{if(nzchar(Sys.getenv("_R_CLASS_MATRIX_ARRAY_")))} but then
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  From \R 4.0.0 on, \code{\link{inherits}(m, "array")} is true for a \code{matrix} \code{m}.
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}
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}
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\examples{
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\examples{
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is.matrix(as.matrix(1:10))
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is.matrix(as.matrix(1:10))
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!is.matrix(warpbreaks)  # data.frame, NOT matrix!
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!is.matrix(warpbreaks)  # data.frame, NOT matrix!
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warpbreaks[1:10,]
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warpbreaks[1:10,]