[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

[R] secondary axis in a plot

Hello, I want to do a plot of two series, but adding a secondary axis in the rigth side to take into account the different scales of the two series. Anyone can tell me haw can I do that in R? Thank you very much Maria -- View this message in context: http://www.nabble.com/secondary-axis-in-a-plo