Hi Mike,

Try this:

SITE <- c(101,102,103,104)
WDAY <- c('MON','TUE','WED','THR','FRI')
TOD <- c('MORN', 'AFTN')
out <- expand.grid(SITE, WDAY, TOD)
out

HTH,
Jorge


On Thu, Mar 25, 2010 at 4:21 PM, Hosack, Michael <> wrote:

> Hello,
>
> I need to create a dataframe containing all possible combinations of three
> variables: SITE (101,102,103,104), WDAY (MON,TUE,WED,THR,FRI), and TOD
> (MORN, AFTN). There should be a total of 40 unique combinations in my
> dataframe. I used expand.grid() successfully(?) to create my dataframe, but
> then when I went to order it by SITE, the resultant dataframe only contained
> four rows, one for each site. There must be something about this function
> that I don't understand. Any advice would be appreciated.
>
> Thank you,
>
> Mike
>
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