[R] Another newbie question

[Peter Alspach]

Kia ora Allen

I'm not sure what you have tried or what your level of understanding is.
However, if your dataframe is:
> allen
  sp1 sp2 sp3
1   0   0   1
2   1   0   1
3   1   1   1
4   0   0   0

> str(allen)
'data.frame':   4 obs. of  3 variables:
 $ sp1: int  0 1 1 0
 $ sp2: int  0 0 1 0
 $ sp3: int  1 1 1 0

Then looking at the output from:

paste(names(allen)[as.logical(unlist(allen[2,]))], collapse='; ')

may help you. 

Hei kona ra ...

Peter Alspach

> -----Original Message-----
> From: r-help-bounces at r-project.org 
> [mailto:r-help-bounces at r-project.org] On Behalf Of AllenL
> Sent: Thursday, 8 January 2009 7:28 a.m.
> To: r-help at r-project.org
> Subject: [R] Another newbie question
> 
> 
> 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
> 
> --
> View this message in context: 
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> 

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