Ruby 矩阵 round() 函数

round() 是Ruby中的一个内置方法，用于返回矩阵的所有数值，并将其四舍五入到小数点后的指定数字。如果没有传递参数，则假定0为默认值。

语法：mat1.round(num)

参数：该函数需要一个非强制性的参数num，矩阵中的数值将被四舍五入。如果没有传递num，则假定其为零。

返回值 : 返回矩阵中所有数值被四舍五入到小数点后的num数字。

例子 1 :

# Ruby program for round() method in Matrix
  
# Include matrix 
require "matrix"
  
# Initialize a matrix 
mat1 = Matrix[[1.878787, 21.8449], [31.7382, 18.7382]]  
  
# Prints all values of matrix 
# rounded by 2 
puts  mat1.round(2)

输出:

Matrix[[1.88, 21.84], [31.74, 18.74]]

例2 :

# Ruby program for round() method in Matrix
  
# Include matrix 
require "matrix"
  
# Initialize a matrix 
mat1 = Matrix[[6.4334, 432.432], [54.342, 323.213]]  
  
# Prints all values of matrix 
# rounded by 0 which is default
puts  mat1.round()