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Ruby | Matrix tr() function

  • Last Updated : 07 Jan, 2020

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
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