Description Arguments Examples
is_lower_triangular
tests if a matrix is lower
triangular
is_upper_triangular
tests if a
matrix is upper triangular
is_triangular_matrix
tests if a matrix is
triangular (both lower or upper triangular)
x |
a matrix |
diag |
should the diagonal be included?
( |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 | some_matrix = matrix(1:9, 3, 3)
lower_matrix <- upper_matrix <- some_matrix
lower_matrix[upper.tri(some_matrix)] <- 0
upper_matrix[lower.tri(some_matrix)] <- 0
is_triangular_matrix(some_matrix) # TRUE
is_triangular_matrix(lower_matrix) # TRUE
is_triangular_matrix(upper_matrix) # TRUE
is_lower_triangular(some_matrix) # FALSE
is_lower_triangular(lower_matrix) # FALSE
is_lower_triangular(upper_matrix) # FALSE
is_upper_triangular(some_matrix) # FALSE
is_upper_triangular(lower_matrix) # FALSE
is_upper_triangular(upper_matrix) # FALSE
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