Thank you all! In future I will include examples of my code to make things
simpler for you. This is what I settled on:
Sp.presence<-Data[,14:31] ##The subset of my data set I'm interested in
(the presence/absence data)
Sp.presence$Species<-apply(Sp.presence,1,function(x)
{c(paste(names(Sp.presence)[x==1],collapse=","))})
Yay!
-Allen
AllenL wrote:
>
> Problem:
> I have a data frame with 1s and 0s denoting presence/absence of species
> (columns) for particular plot measurements (rows). What I want to do is
> make a new column whose entries for each row is a list of the column names
> in which a species is present (ie. for row one its entry might read:
> "sp1","sp2", etc.). I've tried various functions etc. but can't seem to
> get the syntax right/ the correct combination of functions.
> Thanks in advance!
> -Allen
>
>
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