Ruby | Matrix cofactor_expansion() function

Last Updated : 11 Aug, 2021

The cofactor_expansion() is an inbuilt method in Ruby returns the cofactor_expansion of the given matrix along a given row or column. In other words, it returns the Laplace expansion.

Syntax: mat1.cofactor_expansion(row: num or col:num)
Parameters: The function accepts one mandatory parameter row or column whose cofactor_expansion is returned.
Return Value: It returns the cofactor-expansion of the given matrix along the given row or column.

Example 1:

Ruby

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

Output:

-633

Example 2:

Ruby

# Ruby program for cofactor_expansion() method in Matrix
 
# Include matrix 
require "matrix"
 
# Initialize a matrix 
mat1 =  Matrix[[13, 1, 5], [12, 1, 5], [11, 2, 5]] 
 
# Prints the value of mat1.cofactor_expansion
# first row 
puts  mat1.cofactor_expansion(column:0)