[R] contour plot

[huan.huang@bnpparibas.com]

Dear all

I am fighting with contour plot.

I have a continuous response and three factors. The formula argument in
function contourplot() does not like the factors. What I got is really
nonsense, loads of squares in the plot (exactly the same as what the help
page says). I am wondering how I could get some beautiful curves instead of
the ugly squares.

I have really run out all the ideas I can find. Could anybody show me a
way?

Many thanks in advance.

Huan




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