search for: distoutlet

Dear R users, I am sorry to ask you such a pathetic newbie question, but how does one append data at the end of a data frame? I am working with GRASS/R library, but the question is about R. I have a data.frame containing the following variables basinID, distoutlet, drainage_area, slope These variables are stored for all pixels of Grass Raster objects. For each drainage basin (basinID), I'd like to find the maximum of distoutlet. How can I store the pair of info (bv$ID, max(bv$distoutlet)) at each step of the for loop ? I presume something like this cou...