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% File src/library/base/man/lower.tri.Rd
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% File src/library/base/man/lower.tri.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 1995-2007 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{lower.tri}
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\name{lower.tri}
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\alias{lower.tri}
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\alias{lower.tri}
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\alias{upper.tri}
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\alias{upper.tri}
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\usage{
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\usage{
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lower.tri(x, diag = FALSE)
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lower.tri(x, diag = FALSE)
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upper.tri(x, diag = FALSE)
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upper.tri(x, diag = FALSE)
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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 or other \R object with \code{length(dim(x)) == 2}.
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    For back compatibility reasons, when the above is not fulfilled,
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  \item{x}{a matrix.}
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    \code{\link{as.matrix}(x)} is called first.}
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  \item{diag}{logical.  Should the diagonal be included?}
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  \item{diag}{logical.  Should the diagonal be included?}
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}
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}
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\seealso{
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\seealso{
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  \code{\link{diag}}, \code{\link{matrix}}; further \code{\link{row}}
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  \code{\link{diag}},
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  and \code{\link{col}} on which \code{lower.tri()} and
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  \code{\link{matrix}}.
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  \code{upper.tri()} are built.
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}
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}
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\examples{
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\examples{
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(m2 <- matrix(1:20, 4, 5))
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(m2 <- matrix(1:20, 4, 5))
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lower.tri(m2)
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lower.tri(m2)
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m2[lower.tri(m2)] <- NA
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m2[lower.tri(m2)] <- NA