Another newbie question
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: http://www.nabble.com/Another-newbie-question-tp21337371p21337371.html Sent from the R help mailing list archive at Nabble.com.
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