我们可以有更多的错误(消息)吗? [英] Can we have more error (messages)?

问题描述

如果函数使用变量，在R中是否有一种弹出错误消息的方法 没有在函数主体中声明:即，我希望有人标记这种类型的函数

Is there a way, in R, to pop up an error message if a function uses a variable not declared in the body of the function: i.e, i want someone to flag this type of functions

aha<-function(p){
  return(p+n)
}

参见；如果某个地方碰巧有一个"n"变量，那么aha(p = 2)会给我一个答案"，因为R只会从那个叫做环境"的神秘地方取"n"

see; if there happens to be a "n" variable lying somewhere, aha(p=2) will give me an "answer" since R will just take "n" from that mysterious place called the "environment"

推荐答案

如果您想在代码编写阶段而不是在运行时发现此类潜在问题，那么codetools包是您的朋友.

If you want to detect such potential problems during the code-writing phase and not during run-time, then the codetools package is your friend.

library(codetools)
aha<-function(p){ 
  return(p+n) 
}

#check a specific function:
checkUsage(aha) 

#check all loaded functions:
checkUsageEnv(.GlobalEnv)

这些将告诉您no visible binding for global variable ‘n’.

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