获取 R 编程中所有附加包的列表 - search()函数

R 语言中的search()函数用于获取 R 搜索路径中所有附加包的列表。

Syntax: search()

Parameters:
This function takes no parameters.

示例 1：

# R program to list the packages
# attached to R search path
  
# Calling search() function
search()

输出：

[1] ".GlobalEnv"        "package:stats"     "package:graphics" 
[4] "package:grDevices" "package:utils"     "package:datasets" 
[7] "package:methods"   "Autoloads"         "package:base"     

示例 2：

# R program to list the packages
# attached to R search path
  
# Attaching datasets to path
attach(airquality)
attach(BOD)
  
# Calling search() function
search()

输出：

[1] ".GlobalEnv"        "BOD"               "airquality"       
 [4] "package:stats"     "package:graphics"  "package:grDevices"
 [7] "package:utils"     "package:datasets"  "package:methods"  
[10] "Autoloads"         "package:base"