Lower and Upper Triangular Part of a Matrix

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Description

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

Usage

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Arguments

x

a matrix.

diag

logical. Should the diagonal be included?

See Also

diag, matrix.

Examples

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

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