红宝石 |矩阵[]方法

[]()是 Ruby 中的内置方法，返回第 i 行第 j 列的元素。

Syntax: mat1[i, j]

Parameters: The function needs the row number i and column number j whose position element is to be returned.

Return Value: It returns the element at the position mat[i][j].

示例 1 ：

# Ruby program for [] method in Matrix
   
# Include matrix 
require "matrix"
   
# Initialize a matrix 
mat1 = Matrix[[1, 21], [31, 18]]  
   
# Print the element at 1,1
puts  mat1[1, 1]

输出：

18

示例 2 ：

# Ruby program for [] method in Matrix
   
# Include matrix 
require "matrix"
   
# Initialize a matrix 
mat1 = Matrix[[89 , 12, 12], [8, 5, 23], [1, 2, 9]]  
   
# Print the element at 2,3
puts  mat1[2, 2]

输出：

9