[R] convert strings to object names: SUMMARY

Gudrun Jonasdottir
Mon, 23 Aug 2004 12:59:36 -0000

Dear R-list,

Apologies for replying late. Thanks to Andy, Dimitris, James, Uwe, Olaf,
Adai, Gardar and Patrick. (Apologies if I forgot someone)

In summary: The quickest way to convert a string to an object name, seems
to be by using get(dat), but it seems to work equally well if you use any
of

eval(parse(text=dat))
do.call("print", list(as.name(dat)))
eval(substitute(print(x), list(x=as.name(dat))))
assign("dat", get(paste("dat", no, sep="")))

Thanks again,
Gudrun

Gardar Johannessonwrote:
> Use the get() function:
>
>  > dat99 <- matrix(c(1,1,2),3,3)
>  > no <- 99
>  > dat.name <- paste("dat",no,sep="")
>  > get(dat.name)
>       [,1] [,2] [,3]
> [1,]    1    1    1
> [2,]    1    1    1
> [3,]    2    2    2
>  >
>
>
> At 04:15 PM 8/19/2004 +0200, Gudrun Jonasdottir wrote:
>>Dear R-Help list,
>>
>>I have a problem with convertions of strings. I want to use the function
>>"paste()" to create an object name and then use that character
string to
>>call on that object. So, for example:
>>
>>dat99 <- matrix(rbind(1,1,2),3,3)
>>no <- 99
>>dat <- paste("dat",no,sep="")
>>dat
>>[1] "dat99"
>>
>>What should I do to get the output
>>
>>dat
>>      [,1] [,2] [,3]
>>[1,]    1    1    1
>>[2,]    1    1    1
>>[3,]    2    2    2
>>
>>Cheers,
>>Gudrun
>>
>>
>>
>>--
>>Gudrun Jonasdottir, M.Sc.
>>Matematiska institutionen
>>Stockholms Universitet
>>SE- 106 91 Stockholm
>>
>>Work: +46 (0)8 16 45 56
>>Mobile: +46 (0)709 779 800
>>
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>
>