lower.tri {base} | R Documentation |
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)
x |
a matrix or other R object with |
diag |
logical. Should the diagonal be included? |
diag
, matrix
; further row
and col
on which lower.tri()
and
upper.tri()
are built.
(m2 <- matrix(1:20, 4, 5))
lower.tri(m2)
m2[lower.tri(m2)] <- NA
m2