[R] flagging values without a loop

[jcrosbie]

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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