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r09
2011 Nov 01
2
Removal/selecting specific rows in a dataframe conditional on 2 columns
Dear list,
After reading different mails, blogs, and tried a few different codes without any success, I am asking your help!
I have the following data frame where each row represent a survey unit with the following variables:
> names(RV09)
[1] "record.t" "trip" "set" "month" "stratum" "NAFO"
[7] "unit.area" "time" "dur.set" "distance" "operation" "mean.d"
[13] "min.d"...