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"
Cheers,
Simon
> If I run attr(lvls,"levels") in R, I get back the second vector. There are no
> attributes besides class and levels, so how do I get the list of levels in
> the correct order?
>
> Thanks
>
> --
> Mark Lilback
> West Virginia University Department of Statistics
> [email protected]
>
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