[R] Using outer with function predict

[Etienne Stockhausen]

Hey everybody,

I have a problem with the combination of the commands outer() and predict(). I want to visualize the solutions of a regression modell in a matrix. Therefore I want to use the command predict for a linear modell as the function inside the command outer. I've made a small example:

          x = 1:10
          y = 11:20
          z = rnorm(10)
          lm.1 = lm(z ~ x*y)
          mat = outer(x,y, predict, lm.1) 

That didn't work, but I don't understand why? Isn't it possible to combine these two commands? I hope my intention becomes clear. 
I'm looking forward for any ideas or hints, that might help me. 
I wish everybody a nice weekend.

Best regards

Etienne
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