[R] expand.grid() function

From: Megh Dal <megh700004_at_yahoo.com>
Date: Mon, 23 Jun 2008 06:16:42 -0700 (PDT)


  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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