在R函数的参数集中操作输入变量(to manipulate input variable in the set of arguments of R function)

在R函数的参数集中操作输入变量(to manipulate input variable in the set of arguments of R function)

我试图解决R函数中输入变量操作的问题。 功能如下：

testFun<-function(x,y){ x+y }

我想以这样的方式运行：

testFun(x=1,y=5+x)

但是生成了错误：

浏览[1]> testFun（x = 1，y = 5 + x） 换行时出错：找不到对象'x'

从论证评估的角度来看，这是一个错误。 所以我需要将'x'设置为默认值或外部值（我在http://adv-r.had.co.nz/Functions.html#function-arguments中扫描过的详细信息）。

所以我的问题是，是否有可能在一行中进行这样的操作，而不是制作包装或外部值？

它应该有输出：

跑：

testFun（X = 1，Y = 5 + x）的

输出：

7

I am trying to solve the issue of input variable manipulation in R function. The function is as follows:

testFun<-function(x,y){ x+y }

I want to run in such a way:

testFun(x=1,y=5+x)

but the error is generated:

Browse[1]> testFun(x=1,y=5+x) Error during wrapup: object 'x' not found

From the argument evaluation poin of view it is a mistake. So I need to have 'x' either a default value or outside value (details I have scanned in http://adv-r.had.co.nz/Functions.html#function-arguments).

So my question is whether it is possible to make such a manipulation in one row, without making a wrappers or outside values?

It is supposed to have the output:

run:

testFun(x=1,y=5+x)

output:

7

最满意答案

您可以使用<-但它将在您的全局环境中创建变量。 请参阅以下示例：

testFun(x <- 1, y = 5 + x) # [1] 7

You can use <- but it will create the variable in your global environment. See the following for example:

testFun(x <- 1, y = 5 + x) # [1] 7