How to address an R-variable that stores an object of class 'name'?

Question

In a larger R-Script I have to address the content of a character variable that itself is stored within a variable of class name. In the following small example, how do I have to address B to see the content of A (thus "A") and not just the name (thus A)?

> A <- "A"
> B <- as.name(A)
> B
A

akrun · Accepted Answer · 2016-06-26 09:52:55Z

2

We can use get to the retrieve the value

get(A)

From 'B', we can use eval

eval(B)
#[1] "A"

The OP's example is confusing. Just to understand it better,

C <- "A"
B <- as.name(C)
eval(B)
#[1] "A"

answered Jun 26, 2016 at 9:52

akrun

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2 Comments

akrun Over a year ago

@user7417 I am using R 3.3.0 and this is the output I am getting.

user7417 Over a year ago

Sorry, my comment was mutilated and I did not edit it in time. The second line must be B <- as.name("C") otherwise I get the message "Error in eval(expr, envir, enclos) : Object 'A' not found". Anyway, thanks for the eval hint, I'll check it out in my script!

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