i write this code in R
我在R中写这段代码
paste("a","b","c")
which returns the value "abc"
返回值“abc”
Variable abc has a value of 5(say) how do i get "abc" to give me the value 5 is there any function like as.value(paste("a","b","c")) which will give me the answer 5? I am making my doubt sound simple and this is exactly what i want. So please help me. Thanks in advance
变量abc的值为5（比如说）我如何得到“abc”给我值5是否有任何函数，如as.value（paste（“a”，“b”，“c”））这将给出我答案5？我让我怀疑听起来很简单，这正是我想要的。所以请帮助我。提前致谢
3 个解决方案
#1
29
paste("a","b","c") gives "a b c" not "abc"
粘贴（“a”，“b”，“c”）给出“a b c”而不是“abc”
Anyway, I think you are looking for get():
无论如何，我认为你正在寻找get（）：
> abc <- 5
> get("abc")
[1] 5
#2
6
An addition to Sacha's answer. If you want to assign a value to an object "abc" using paste():
萨莎的回答是一个补充。如果要使用paste（）为对象“abc”赋值：
assign(paste("a", "b", "c", sep = ""), 5)
#3
6
This is certainly one of the most-asked questions about the R language, along with its evil twin brother "How do I turn x='myfunc' into an executable function?" In summary, get, parse, eval , expression are all good things to learn about. The most useful (IMHO) and least-well-known is do.call , which takes care of a lot of the string-to-object conversion work for you.
这肯定是关于R语言最常见的问题之一，以及它邪恶的双胞胎兄弟“我如何将x ='myfunc'变成可执行函数？”总之，get，parse，eval，expression都是值得学习的好东西。最有用的（恕我直言）和最不为人所知的是do.call，它负责很多字符串到对象的转换工作。
#1
29
paste("a","b","c") gives "a b c" not "abc"
粘贴（“a”，“b”，“c”）给出“a b c”而不是“abc”
Anyway, I think you are looking for get():
无论如何，我认为你正在寻找get（）：
> abc <- 5
> get("abc")
[1] 5
#2
6
An addition to Sacha's answer. If you want to assign a value to an object "abc" using paste():
萨莎的回答是一个补充。如果要使用paste（）为对象“abc”赋值：
assign(paste("a", "b", "c", sep = ""), 5)
#3
6
This is certainly one of the most-asked questions about the R language, along with its evil twin brother "How do I turn x='myfunc' into an executable function?" In summary, get, parse, eval , expression are all good things to learn about. The most useful (IMHO) and least-well-known is do.call , which takes care of a lot of the string-to-object conversion work for you.
这肯定是关于R语言最常见的问题之一，以及它邪恶的双胞胎兄弟“我如何将x ='myfunc'变成可执行函数？”总之，get，parse，eval，expression都是值得学习的好东西。最有用的（恕我直言）和最不为人所知的是do.call，它负责很多字符串到对象的转换工作。