Try:
a <- read.csv("book1.csv", as.is = TRUE)
to read the columns in as "character" class rather than the default of
"factor" .
See ?read.csv
On 1/14/07, Teng Sun <[EMAIL PROTECTED]> wrote:
> Suppose I have two columns of entries, how can I get the union of the
> two columns? Please note: I input my columns through excel. These
> entries have text format in excel. Also, out of curiosity, how can I
> find out the data type of a data frame ?
>
>
> > a <- read.csv("book1.csv")
> > a
> n1 n2
> 1 apple soda
> 2 orange apple
> 3 soda green
> 4 red yellow
> 5 white blue
> 6 white
>
> > union(a$n1,a$n2)
> [1] 2 3 5 4 6 1
>
> I want the actual names instead of the indexes.
>
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>
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