Ruby | Matrix first_minor() function

The first_minor() is an inbuilt method in Ruby returns the submatrix after removing the specified row and column. 

Syntax: mat1.first_minor(row_num, col_num)
Parameters: The function needs the row number and column number which are to be removed 
Return Value: It returns the submatrix after removal.

Example 1: 

Ruby

# Ruby program for first_minor method in Matrix

# Include matrix
require "matrix"

# Initializes the matrix
mat1 = Matrix[[12, 21], [31, 12]]

# Prints the submatrix after removing
puts  mat1.first_minor(1, 1)

Output: 

Matrix[[12]]

Example 2: 

Ruby

# Ruby program for first_minor method in Matrix

# Include matrix
require "matrix"

# Initializes the matrix
mat1 = Matrix[[6, 7], [9, 10], [12, 4]]

# Prints the submatrix after removing
puts  mat1.first_minor(0, 1)

Output: 

Matrix[[9], [12]]