Alessandro Antonucci wrote:
> 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
R (i.e. read.csv) assumes this is numeric rather than categorical data.
Hence specify the class of each variable in read.cvs' argument "colClasses".
Uwe Ligges
> the same instruction returns an empty output instead of 6 7
>
> Any idea about that?
>
> Thanks in advance,
> Alessandro
>
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