R help - Oct 2009 - Converting a Vector into a 2-level Factor

Hello Everyone,

Let's say I have a vector as follows:

vowels = c("aa", "aa", "ah", "ao",
"eh)

I want to make a factor consisting of two levels: the things that are  
"aa" and those that are not "aa".  How would I do that?

I tried using factor(vowels, levels=c("aa", "~aa"),
exclude=NULL), but
this gives me '<NA>' or missing values, which is not what I want. 
If
there is no way to get two levels, then how do I convert the NAs to  
another symbol of my choosing?

Any suggestions are welcome.

Thanks.

Try this;

factor(vowels == "aa", labels = c("aa", "~aa"))

On Thu, Oct 22, 2009 at 4:36 AM,  <ntyson at clovermail.net>
wrote:
> Hello Everyone,
>
> Let's say I have a vector as follows:
>
> vowels = c("aa", "aa", "ah", "ao",
"eh)
>
> I want to make a factor consisting of two levels: the things that are
"aa"
> and those that are not "aa". ?How would I do that?
>
> I tried using factor(vowels, levels=c("aa", "~aa"),
exclude=NULL), but this
> gives me '<NA>' or missing values, which is not what I want.
?If there is no
> way to get two levels, then how do I convert the NAs to another symbol of
my
> choosing?
>
> Any suggestions are welcome.
>
> Thanks.
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>


-- 
Henrique Dallazuanna
Curitiba-Paran?-Brasil
25? 25' 40" S 49? 16' 22" O