is_triangular_matrix: Is triangular matrix

In tester: Tests and checks characteristics of R objects

Description

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)

Arguments

x	a matrix
diag	should the diagonal be included? (FALSE by default)

Examples

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

Example output

[1] FALSE
[1] TRUE
[1] TRUE
[1] FALSE
[1] TRUE
[1] FALSE
[1] FALSE
[1] FALSE
[1] TRUE

tester documentation built on May 2, 2019, 1:09 p.m.