On Mon, Jun 15, 2009 at 4:47 PM, Laurent Gautier<lgaut...@gmail.com> wrote:
>
> What is already not working in an R session has somewhat limited chances
> of working with rpy2.
>
>> library(MASS)
>> attach("birthwt")
> Error in attach("birthwt") : file 'birthwt' not found
>
> The R function attach() is working on symbols, not on strings.
>
>> attach(get("birthwt"))
> works, and so would in rpy2
>
> r.attach(r["birthwt"])
> #note: detaching that one is left as an exercise for the reader.
>
> L.
That does help clarify things. In R these appear to be equivalent (the
first using a string, the second a symbol):
attach(get("birthwt"))
attach(birthwt)
Likewise for the library function, you can do either (string or symbol):
library("MASS")
library(MASS)
So in rpy (or rpy2), we can call the library function with a string
because R understands that. But, for attach, R does not expect a
string, just a symbol, hence the failure. I think I have learnt a
little more about R today :)
Thank you,
Peter
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