[R] levels of an array (strings and numbers)

Alessandro Antonucci alessandro at idsia.ch
Thu Aug 3 18:11:04 CEST 2006


Reading a csv file (db.csv) as:

yes,full
no,full
no,empty

I can use the command 'levels' to extract
the different values appearing for each
column as follows:

> d<-read.csv("db.csv")
> levels(d[,2])

which returns

> [1] "empty" "full" 

while, doing the same with a numerical csv file as:

1,6
0,6
0,7

the same instruction returns an empty output instead of 6 7

Any idea about that?

Thanks in advance,
Alessandro

-- 
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Alessandro Antonucci
Dalle Molle Institute for Artificial Intelligence (IDSIA)
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