Ruby | Matrix upper_triangular?() function

The upper_triangular?() is an inbuilt method in Ruby returns a boolean value. It returns true if it is a lower-triangular matrix, else it returns false.

Syntax: mat1.upper_triangular?()

Parameters: The function needs the matrix to be checked for lower-triangular.

Return Value: It returns true if it is a lower-triangular matrix, else it returns false.

Example 1:

# Ruby program for upper_triangular?() method in Matrix

# Include matrix
require "matrix"

# Initialize a matrix
mat1 = Matrix[[1, 21], [31, 18]]

# Prints if upper_triangular or not
puts  mat1.upper_triangular?()

Output:

false

Example 2:

# Ruby program for upper_triangular?() method in Matrix

# Include matrix
require "matrix"

# Initialize a matrix
mat1 = Matrix[[31, 18, 19], [0, 3, 2],  [0, 0, 1]]

# Prints if upper_triangular or not
puts  mat1.upper_triangular?()

Output:

true