红宝石 |矩阵 cofactor()函数

cofactor()是 Ruby 中的一个内置方法，它返回给定索引的辅因子。

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.

示例 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)

输出：

1

示例 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)

输出：

-1