Hi,
   
  I have one question on expand.grid() function.
   
  When I write following syntax :expand.grid(c("u", "l"), c("u", "l"), c("u", "l")) I get following as desired :
    Var1 Var2 Var3
1    u    u    u
2    l    u    u
3    u    l    u
4    l    l    u
5    u    u    l
6    l    u    l
7    u    l    l
8    l    l    l

  However I wanted to write that in more concise manner. Therefore I tried : expand.grid(rep(c("u", "l"), 3)). But I did not get answer that I previously got. Can people here clarify me why it is not like that? Then what would be the mose concise way to do that?
   
   
  
 

       
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