Hi I need to do something very simple. I have 2 variables, Y and M. I need to multiply Y by 1 if M=1, by 2 if M=3 and by 3.6678 if M=9. How do i make it? Thanks for your time and interest -- View this message in context: http://r.789695.n4.nabble.com/Multiply-variable-by-condition-tp4632086.html Sent from the R help mailing list archive at Nabble.com.