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...and known) I am sure it is very easy but I don't find it (I tryed which but it doesn't seem to work) Surely I could do a loop but I want to learn how to do things without time consuming loops. Thanks Colin -- View this message in context: http://n4.nabble.com/Accessing-values-of-a-matrix-tp1561932p1561932.html Sent from the R help mailing list archive at Nabble.com.