Once you have the long format of the dataset, you could just code a "bin" variable and merge with this bin variable instead. Piece o' cake, ain't it?
Daniel ------------------------- cuncta stricte discussurus ------------------------- -----Ursprüngliche Nachricht----- Von: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] Im Auftrag von Steve Murray Gesendet: Friday, August 14, 2009 3:05 PM An: dmal...@rhsmith.umd.edu; r-help@r-project.org; jholt...@gmail.com Betreff: Re: [R] Assigning values based on a separate reference (lookup) table Thanks to you both for your responses. 3 I think these approaches will *nearly* do the trick, however, the problem is that the reference/lookup table is based on 'bins' of latitude values, eg.>61, 60-56, 55-51, 50-46 etc. whereas the actual data (in my 720 x 360 data frame) are not binned, e.g. 89.75, 89.25, 88.75, 88.25, 87.75 etc. - instead they 'increment' by -0.5 each time, and therefore many of the 367200 values which are in the data frame will have latitude values falling into the same 'reference' bin. It's for this reason that I think the 'merge' approach might fall down, unless there's a way of telling 'merge' that latitude can still be considered to match if they fall within a range. For example, if my 720 x 360 data frame has values whose corresponding latitude (row name) values are, say, 56.3, 55.9, 58.2, 56.8 and 57.3, then the original value in the grid needs to be assigned a 'p' value which corresponds with what is read off of the reference table from the bin 56-60. Hope this makes sense! If not, please feel free to ask for clarification. Many thanks again, Steve _________________________________________________________________ oticons. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
