



For each date, I would like to keep the line with the lowest speed and discard the rest.  The result would have one line for each date.  Can I use aggregate for this?

My table is as follows:
structure(list(speed = c(3,9,14,8,7,6), result = c(0.697, 0.011, 0.015, 0.012, 0.018, 0.019), house = c(1, 
1, 1, 1, 1, 1), date = c(719, 1027, 1027, 1027, 1030, 1030), 
    id = c("1000", "10000", 
    "10001", "10002", "10003", "10004")), .Names = c("speed", 
"result", "house", "date", "id"), class = "data.frame", row.names = c("1000", 
"10000", "10001", "10002", "10003", "10004"))

Thanks,
Jeffrey

 		 	   		  
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