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

[Remolabarac]

Hello,

following on  - on this subject:

i have tried the following:

natural_nums <- 1:10
even_nums <- seq(2,10, by = 2)
types <- c("log(natural_nums)~time", "even_nums") 
types <- lapply(types, as.name)  ## list of variable names types 

[[1]]
`log(natural_nums)~time`

[[2]]
even_nums


as you see types[[1]] has the annoying ` ` before and after my expression.
How can I remove this?

I want to do this because I want to generate a list of expression like
c(log(a1)~time,log(a2)~time,....) using a for loop and then use this to do
regressions.

Please help.

Thanks.

 




Ng Stanley wrote:
> 
> Thanks everyone.
> 
> On 3/14/08, Simon Blomberg <s.blomberg1 at uq.edu.au> wrote:
>>
>> Or maybe use assign?
>>
>> > assign("natural_nums", 1:10)
>> > natural_nums
>> [1]  1  2  3  4  5  6  7  8  9 10
>> >
>>
>> Cheers,
>>
>> Simon.
>>
>> On Fri, 2008-03-14 at 14:39 +1000, Bill.Venables at csiro.au wrote:
>> > 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
>> > CSIRO Laboratories
>> > PO Box 120, Cleveland, 4163
>> > AUSTRALIA
>> > Office Phone (email preferred): +61 7 3826 7251
>> > Fax (if absolutely necessary):  +61 7 3826 7304
>> > Mobile:                         +61 4 8819 4402
>> > Home Phone:                     +61 7 3286 7700
>> > mailto:Bill.Venables at csiro.au
>> > http://www.cmis.csiro.au/bill.venables/
>> >
>> > -----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 ?
>> >
>> >       [[alternative HTML version deleted]]
>> >
>> > ______________________________________________
>> > R-help at r-project.org mailing list
>> > https://stat.ethz.ch/mailman/listinfo/r-help
>> > PLEASE do read the posting guide
>> > http://www.R-project.org/posting-guide.html
>> > and provide commented, minimal, self-contained, reproducible code.
>> >
>> > ______________________________________________
>> > R-help at r-project.org mailing list
>> > https://stat.ethz.ch/mailman/listinfo/r-help
>> > PLEASE do read the posting guide
>> http://www.R-project.org/posting-guide.html
>> > and provide commented, minimal, self-contained, reproducible code.
>> --
>> Simon Blomberg, BSc (Hons), PhD, MAppStat.
>> Lecturer and Consultant Statistician
>> Faculty of Biological and Chemical Sciences
>> The University of Queensland
>> St. Lucia Queensland 4072
>> Australia
>> Room 320 Goddard Building (8)
>> T: +61 7 3365 2506
>> http://www.uq.edu.au/~uqsblomb
>> email: S.Blomberg1_at_uq.edu.au
>>
>> Policies:
>> 1.  I will NOT analyse your data for you.
>> 2.  Your deadline is your problem.
>>
>> The combination of some data and an aching desire for
>> an answer does not ensure that a reasonable answer can
>> be extracted from a given body of data. - John Tukey.
>>
>>
> 
> 	[[alternative HTML version deleted]]
> 
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
> 
> 

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