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rownum
2008 Dec 07
2
subsetting large data frames.
...d in ?catches. That is to say, the
combination of these 5 variables is unique. One or more of the variables
could be the same but the combination would be unique. This is confusing to
explain so here is a short example to explain what I am trying to explain:
Example data catches:
Row Cruise Order Townumber Towtype Ship Netlocation Var1 Var2
1 22 1 4 A B S X1 X2
2 22 1 4 A B S X1 X2
3 22 1 4 BL AM S X1 X2
4 22 1 4...