红宝石 |矩阵 cofactor_expansion()函数

cofactor_expansion()是 Ruby 中的一个内置方法，它沿给定行或列返回给定矩阵的 cofactor_expansion。换句话说，它返回 拉普拉斯展开。

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.

示例 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)

输出：

-633

示例 2 ：

红宝石

# 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)

输出：

-5