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Ruby | Matrix cofactor() function
  • Last Updated : 07 Jan, 2020

The cofactor() is an inbuilt method in Ruby returns the cofactor of the given index.

Syntax: mat1.cofactor(i, j)

Parameters: The function needs two index i and j, whose cofactor is to be returned.

Return Value: It returns the cofactor of the given index.

Example 1:



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# Ruby program for cofactor() method in Matrix
   
# Include matrix 
require "matrix"
   
# Initialize a matrix 
mat1 = Matrix[[1, 21], [31, 18]]  
   
# Prints the value of mat1.cofactor()
puts  mat1.cofactor(1,1)

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Output:

1

Example 2:

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# Ruby program for cofactor() method in Matrix
   
# Include matrix 
require "matrix"
   
# Initialize a matrix 
mat1 =  Matrix[[1, 1, 5], [1, 1, 5], [1, 2, 5]]  
   
# Prints the value of mat1.cofactor()
puts  mat1.cofactor(1,2)

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Output:

-1
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