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Message: [QUOTE="Jürgen Exner, post: 4863126"] Different approaches do the same problem. You are favouring reducing/adjusting the data domain such that you can use standard Perl operators while I favour adding a new comparison operator to my data algebra, i.e. I have a given data domain and create the proper comparison operator for that given domain. To me my approach is much cleaner and simpler because I don't have to tweak the data set just to make the comparison work. Also, I am not convinced that your speed argument is correct, but it's really not important enough to write a big benchmark test. To everyone his own, I guess. jue [/QUOTE]