Ruby | Matrix cofactor() function

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:

# 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)

Output:

1

Example 2:

# 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)

Output:

-1