On Jan 25, 2012, at 12:10 PM, yan wrote: > thanks petr, > what if I got 200 elements, so I have to write expand.grid(x1=1, > x2=1:2, > x3=1:3, x4=1:3, x5=1:3....x200=1:3))? Perhaps same thing that will happen when those monks finish the Towers of Hanoi? 2*3^198 [1] 5.902533e+94 -- David Winsemius, MD West Hartford, CT