[R] concatenating factor from list

[Sebastian Luque]

Sebastian Luque <spluque at gmail.com> wrote:

"Gabor Grothendieck" <ggrothendieck at gmail.com> wrote:

>> Is this ok or is it what you are trying to avoid:

>> factor(unlist(lapply(cutYield, as.character)))

> Thank you Gabor.  The problem with that is what if some levels do not
> appear in any member of cutYield?

This addition to your code takes care of that, although it's a bit
expensive:

factor(unlist(lapply(cutYield, as.character)),
       levels = unique(unlist(lapply(test, levels))))


Thanks!

-- 
Sebastian P. Luque