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.... My questions are: Why I am obtaining such an error? Is there any function that works like apply, but enables me to use two matrices as input data? Thanks in advance for any help. Greetings, Michal -- View this message in context: http://n4.nabble.com/Usage-of-apply-function-with-two-matrices-tp1590442p1590442.html Sent from the R help mailing list archive at Nabble.com.