[R] merging two lists but get indexes

From: Teng Sun <ewisdom_at_gmail.com>
Date: Sun 14 Jan 2007 - 13:37:10 GMT

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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