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when toggle format what by license comment
Mar 27, 2015 at 23:06 comment added Anupam it means first x$a will be sorted then x$b based on x$a , and then x$c based on x$a and x$b , isn't it?
Nov 12, 2010 at 15:56 vote accept ilya
Nov 12, 2010 at 15:49 comment added ilya column "a" not ordered, but grouped. Order of "a" in data.frame is important.
Nov 12, 2010 at 15:44 history answered Spacedman CC BY-SA 2.5