I was banging my head for an hour on this. I just pasted the code into an email
and see that I was getting the contents of the SEXP for the factor, not the one
returned by getAttrib. Sorry for the waste of time.
On Oct 24, 2012, at 4:16 PM, Simon Urbanek <simon.urba...@r-project.org> wrote:
>
> On Oct 24, 2012, at 2:14 PM, Mark Lilback wrote:
>
>> I'm working on an R package in C and can't seem to get the same level
>> information about a factor that the R console displays.
>>
>> If I define a factor as:
>>
>> lvls <- factor(c('red','blue','blue','green','red'),
>> c('blue','green','red'), ordered=TRUE)
>>
>> When I get the "levels" attribute in C, I get back the the first vector, not
>> the second.
>
> What are you using in C? AFAICS it works just fine:
>
>> f=cfunction(c(foo="factor"), "return getAttrib(foo, R_LevelsSymbol);")
>> f(lvls)
> [1] "blue" "green" "red"
>
--
Mark Lilback
West Virginia University Department of Statistics
mlilb...@stat.wvu.edu
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