Returns a matrix of logicals the same size of a given matrix with entries TRUE in the lower or upper triangle.
lower.tri(x, diag = FALSE)
upper.tri(x, diag = FALSE)| Parameter | Description |
|---|---|
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? |
# NOT RUN {
(m2 <- matrix(1:20, 4, 5))
lower.tri(m2)
m2[lower.tri(m2)] <- NA
m2
# }