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2006 Mar 15
1
filtering in aggregate
Hello all,
I have a data frame with year, month, species, fishing gear and catch
(Y, M, S, F, C) and I want the sum of C by Y for species "A" and fishing
gear "trawl".
I tried things like aggregate(C[S=="A" & F=="trawl"], list (Year =
Y[S=="A" & F=="trawl"]), fun=sum), but it didn't worked.
To overcome this problem I did