[R] How to add a variable to a dataframe whose values are conditional upon the values of an existing variable

[Henrique Dallazuanna]

You can work with factor also:

week <- c('SAT', 'SUN', 'MON', 'FRI')
factor(week, levels = week, labels = 1:4)

On Fri, Feb 26, 2010 at 4:31 PM, Steve Matco <h20strider at yahoo.com> wrote:
> Hi everyone,
>
> I am at my wits end with what I believe would be considered simple by a more experienced R user. I want to know how to add a variable to a dataframe whose values are conditional on the values of an existing variable. I can't seem to make an ifelse statement work for my situation. The existing variable in my dataframe is a character variable named DOW which contains abbreviated day names (SAT, SUN, MON.....FRI). I want to add a numerical variable named DOW1 to my dataframe that will take on the value 1 if DOW equals "SAT", 2 if DOW equals "SUN", 3 if DOW equals "MON",.....,7 if DOW equals "FRI".
> I  know this must be a simple problem but I have searched everywhere and tried everything I could think of. Any help would be greatly appreciated.
>
> Thank you,
>
> Mike
>
>
>
>
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-- 
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O