[R] Help in creating a matrix

[arunkumar1111]

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])
      }  
   }






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Thanks in Advance
        Arun
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