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> From: R-help [mailto:r-help-boun...@r-project.org] On Behalf Of Bert
> Gunter
> Sent: Tuesday, June 06, 2017 12:14 PM
> To: Doran, Harold
> Cc: r-help@r-project.org
> Subject: Re: [R] Force argument to have quotes
>
> Harold:
>
> As a general rule, if you are usi
Harold:
As a general rule, if you are using eval(parse(...)) you are doing it
poorly in R; cf
library("fortunes")
fortune(106)
Why is something like this not suitable:
fun1 <- function(a1,a2,a3 = c("hi","by"))
{
cat(a3,a1+a2,"\n")
}
> fun1 (1,2)
hi by 3
> fun1(1,2, a3 = "whoopee")
whoopee
If I understand you correctly what you are really asking is how to embed quotes
in a string so that it can be parse()'d as an expression. The answer would be:
escape the quotes.
R > myOptions <- "Hello"
R > eval(parse(text = paste( "print(", myOptions, ")" )))
Error in print(Hello) : object
I am writing a program where non-technical R users will read in a config file
and the config file will then parse the arguments found within the config and
pass them to respective functions. I'm having trouble (efficiently) writing a
piece of code to retain quotation marks around the argument
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