Re: [R] Create a data subset

PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. You should at least provide a sample of the data that you are working with and what you might think the desir

[R] Create a data subset

Hello, I want to select same data of a data frame that has information of fish catches: catch, vessel, trip, day, month, year where trip is the fishing operation number done in each day by each vessel, i.e. for each day, any vesel can have several register of catch corresponding to each ope