使用 R 删除名称以模式开头的工作区对象 [英] Removing workspace objects whose name start by a pattern using R

问题描述

我经常创建名称以tp_"开头的临时对象，并使用用户定义的函数.为了保持工作区干净，我想创建一个删除临时文件的函数，同时保留用户定义的函数.

I often create temporary objects whose names start by 'tp_' and use user-defined function. In order to keep a clean workspace, I would like to create a function that removes temporary files while keeping user-defined functions.

到目前为止，我的代码是:

So far, my code is:

rm(list = setdiff(ls(), lsf.str())) # Removes all objects except functions
rm(list = ls(, pattern = "tp_")) # Removes all objects whose name contain 'tp_'

我想:

1. 改进第二个函数，以便删除名称开始 'tp_' 的对象(到目前为止，它删除了名称包含 'tp_' 的对象).我试过 substr(ls(), 1, 3) 但不知何故无法将它集成到我的函数中.
2. 将这两个功能合二为一.

1. Improve the second function so that is removes objects whose name start by 'tp_' (so far, it removes objects whose name contains 'tp_'). I've tried substr(ls(), 1, 3) but somehow cannot integrate it to my function.
2. Combine these two functions into one.

一些 R 对象:

tp_A = 1
myfun = function(x){sum(x)}
atp_b = 3

该函数应仅从工作区中删除 tp_A.

The function should remove only tp_A from the workspace.

推荐答案

模式参数使用正则表达式.您可以使用插入符号 ^ 来匹配字符串的开头:

The pattern argument uses regular expressions. You can use a caret ^ to match the beginning of the string:

rm(list=ls(pattern="^tp_"))
rm(list=setdiff(ls(pattern = "^tp_"), lsf.str()))

但是，除了名称前缀之外，还有其他模式可用于管理临时项目/保持干净的工作区.

However, there are other patterns for managing temporary items / keeping clean workspaces than name prefixes.

考虑，例如，

temp<-new.env()
temp$x <- 1
temp$y <- 2
with(temp,x+y)
#> 3
rm(temp)

另一种可能是 attach(NULL,name="temp") 和 assign.

Another possibility is attach(NULL,name="temp") with assign.

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