在 R 编程中按对象的索引值对对象的元素进行排序 - order()函数

R 语言中的order()函数用于按对象的索引值对对象进行排序。这些对象可以是向量、矩阵或数据帧。此函数接受布尔值作为参数以升序或降序排序。

Syntax:
order(x, decreasing, na.last)

Parameters:
x: Vector to be sorted
decreasing: Boolean value to sort in descending order
na.last: Boolean value to put NA at the end

示例 1：

# R program to sort a vector by index values
  
# Creating a vector
x <- c(7, 4, 3, 9, 1.2, -4, -5, -8, 6, NA)
  
# Calling order() function
order(x)

输出：

[1]  8  7  6  5  3  2  9  1  4 10

示例 2：

# R program to sort a vector by index values
  
# Creating a vector
x <- c(7, 4, 3, 9, 1.2, -4, -5, -8, 6, NA)
  
# Calling order() function
# to sort in decreasing order
order(x, decreasing = TRUE)
  
# Calling order() function
# to print NA at the end
order(x, na.last = TRUE)

输出：

[1]  4  1  9  2  3  5  6  7  8 10
 [1]  8  7  6  5  3  2  9  1  4 10