Ruby | Matrix tr() function

The tr() is an inbuilt method in Ruby returns the trace i.e., sum of diagonal elements of the matrix.

Syntax: mat1.tr()

Parameters: The function needs the matrix whose trace is to be returned.

Return Value: It returns the trace.

Example 1:

# Ruby program for tr() method in Matrix

# Include matrix
require "matrix"

# Initialize a matrix
mat1 = Matrix[[3, 12], [2, 8]]

# Prints the trace
puts  mat1.tr()

Output:

11

Example 2:

# Ruby program for tr() method in Matrix

# Include matrix
require "matrix"

# Initialize a matrix
mat1 = Matrix[[1, 0, 6], [6, 1, 7], [1, 2, 19]]

# Prints the trace
puts  mat1.tr()

Output:

21