search for: seq_by

...saving in typing (which would be trivial anyway). There *ought* to be no significant difference in speed (though that seems to have been the motive for rep.int). Are you trying to let students learn R without ever learning about specifying arguments by name? And where would you stop? How about seq_by(a,b,s) rather than having to arduously type seq(a,b,by=s)? Maybe we should have glm_binomial, glm_poisson, etc. so we don't have to remember the "family" argument? This way lies madness... Radford Neal