[R] How to turn a string into a variable name ?

[Bill.Venables at csiro.au]

I'm not sure why you would wish to do so, but it can be done:

> natural_nums <- 1:10
> even_nums <- seq(2,10, by = 2)
> types <- c("natural_nums", "even_nums")

> types <- lapply(types, as.name)  ## list of variable names
> types
[[1]]
natural_nums

[[2]]
even_nums

> eval(types[[1]])
 [1]  1  2  3  4  5  6  7  8  9 10
> eval(types[[2]])
[1]  2  4  6  8 10 


Bill Venables
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-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org]
On Behalf Of Ng Stanley
Sent: Friday, 14 March 2008 1:27 PM
To: r-help
Subject: [R] How to turn a string into a variable name ?

Hi,

For example,

natural_nums <- 1:10
even_nums <- seq(2,10, by = 2)
types <- c("natural_nums", "even_nums")

What functions can be performed on types[1] to turn it into a variable
name
and not a string ?

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