For a given hour I want to be able to  add a new column called flag.  The
flag column will flag the highest price in a given hour.  Is there a way to
do this without a loop? 

matrix:
Unit,   Day,    Hour,   Price,  Flag
afd1    1/2/2003        1       1       N
afd1    1/2/2003        1       2       N
afd1    1/2/2003        1       3       N
afd1    1/2/2003        1       4       Y
dcf1    1/2/2003        2       2       N
dcf1    1/2/2003        2       3       Y
dcf1    1/2/2003        2       1       N
dcf1    1/2/2003        2       2       N
dcf1    1/2/2003        2       3       Y
ghg2    1/2/2003        3       1       N
afd1    1/2/2003        3       2       N
.....


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