R help - Apr 2012 - Help in creating a matrix

Hi

I have dataset with n variables, say n =3  x y z

the formula should be form = x+y+z+x*x +x*y+x*z +y*y + y*z+z*z

my code has to for  loop 

Is there any way  to reduce two loops

  for (i in 1:n)
   {
      for (j in i:n)
      {
        dat= cbind(dat,dat[,i]*dat[,j])
      }  
   }






-----
Thanks in Advance
        Arun
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>I have dataset with n variables, say n =3  x y z
>the formula should be form = x+y+z+x*x +x*y+x*z +y*y + y*z+z*z
>my code has to for  loop
>Is there any way  to reduce two loops
>  for (i in 1:n)
>  {
>      for (j in i:n)
>     {
>        dat= cbind(dat,dat[,i]*dat[,j])
>      }
>   }

Yes; use outer

But 
- Why only two levels of looping for three variables?
- What have i, j and dat to do with the formula? 
- Why doesnt the formula appear anywhere in the loop?


-----
Thanks in Advance
        Arun
--
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http://r.789695.n4.nabble.com/Help-in-creating-a-matrix-tp4551532p4551532.html
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The formula is created sepearately and data is created for the formula and
then use the modelling lm 

-----
Thanks in Advance
        Arun
--
View this message in context:
http://r.789695.n4.nabble.com/Help-in-creating-a-matrix-tp4551532p4551967.html
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