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Hello everyone, I was asked to repost this again, sorry for any inconvenience. I'm looking replacement for ddply function from plyr package. Function allows to apply function by category stored in any column/columns. Regular loops or lapplys slow down greatly because my unique combination count exceeds 9000. Is there any available solution which allow me to apply function by category?

By any chance has anyone put together the R code for reproducing the Firefox Downloads Analytics Map in R? Here is a link to an example: http://www.knitwareblog.com/wp-content/uploads/2008/06/firefox-3-download-map.jpg I'll try to track down the inputs, but I am interested in putting the code to produce this or something similar. Any hints about the best packages, or references to R Blog