[R] Creating dataframe of all possible variable combinations

Hosack, Michael mhosack at state.pa.us
Thu Mar 25 21:21:02 CET 2010


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,


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