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

TRUE

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

a matrix.

logical. Should the diagonal be included?

diag, matrix.

diag

matrix

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

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