lower.tri: Lower and Upper Triangular Part of a Matrix
In robertzk/monadicbase: The R Base Package

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

1 2	lower.tri(x, diag = FALSE) upper.tri(x, diag = FALSE)

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

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

robertzk/monadicbase documentation built on May 27, 2019, 10:35 a.m.

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