# lower.tri

0th

Percentile

##### Lower and Upper Triangular Part of a Matrix

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

Keywords
array
##### Usage
lower.tri(x, diag = FALSE)
upper.tri(x, diag = FALSE)
##### Arguments
x

a matrix or other R object with length(dim(x)) == 2. For back compatibility reasons, when the above is not fulfilled, as.matrix(x) is called first.

diag

logical. Should the diagonal be included?

diag, matrix; further row and col on which lower.tri() and upper.tri() are built.
library(base) # NOT RUN { (m2 <- matrix(1:20, 4, 5)) lower.tri(m2) m2[lower.tri(m2)] <- NA m2 # }