[R] Conversion of strings to expressions

[Dimitris Rizopoulos]

Hi Alexander,

I'm not quite sure of what you want, but maybe this will help:

vec <- c(1,2,3,2)
get("vec")==2

Best,
Dimitris

----
Dimitris Rizopoulos
Ph.D. Student
Biostatistical Centre
School of Public Health
Catholic University of Leuven

Address: Kapucijnenvoer 35, Leuven, Belgium
Tel: +32/16/396887
Fax: +32/16/337015
Web: http://www.med.kuleuven.ac.be/biostat/
     http://www.student.kuleuven.ac.be/~m0390867/dimitris.htm


----- Original Message ----- 
From: "Alexander Sokol" <alexandersokol at ofir.dk>
To: <R-help at stat.math.ethz.ch>
Sent: Thursday, November 04, 2004 3:00 PM
Subject: [R] Conversion of strings to expressions


> Hello,
>
> I'm not sure how to state my question in a technically accurate 
> manner, so
> I'll use a short example to clarify my problem:
>
> Say I have a vector,
>
> vec<-c(1,2,3,2)
>
> I would like to be able to "reference" the vector by using the 
> string
> containing the name of the vector - that is, I would like to know of 
> some
> function which is able to convert the string "vec" into the vector 
> vec itself.
> The purpose of this is to be able to do something like
>
>>somefunc("vec")==2
> [1] FALSE TRUE FALSE TRUE
>
> I hope it is clear from this what the problem is. It seems to me 
> that the
> function desired is akin to a sort of "inverse" to the quote() 
> function, but I
> have been unable to find such a function.
>
> I am using R 1.9.1 on Windows 2000 SP4. Does anyone have a 
> suggestion of how
> to solve the problem?
>
> Thanks,
> Alexander
>
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