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lower.tri {base}

Lower and Upper Triangular Part of a Matrix
Package: 
base
Version: 
R 3.0.2

Description

Returns a matrix of logicals the same size of a given matrix with entries TRUE in the lower or upper triangle.

Usage

lower.tri(x, diag = FALSE)
upper.tri(x, diag = FALSE)

Arguments

x
a matrix.
diag
logical. Should the diagonal be included?

See Also

diag, matrix.

Examples

(m2 <- matrix(1:20, 4, 5))
lower.tri(m2)
m2[lower.tri(m2)] <- NA
m2

Documentation reproduced from R 3.0.2. License: GPL-2.