[R] merging two lists but get indexes

[Gabor Grothendieck]

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 <ewisdom at gmail.com> 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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