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...a matrix of 1000*100. Each row is a AR(1). I think there should be a quicker way to do that? (the easies way is simulate ar(1) 1000 times, but it waste time, I think) Thank you very much for your reply! Fang -- View this message in context: http://www.nabble.com/help-with-simulate-AR%281%29-data-tp18597351p18597351.html Sent from the R help mailing list archive at Nabble.com.