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Maple 15 giving me a headache

  1. Sep 29, 2011 #1
    1. The problem statement, all variables and given/known data

    You know, you think by the fifteen verison, they could do something right.

    I am trying to make a contour plot of [tex]z = f(x,y) = x^3 - 2xy[/tex]

    So I typed the following

    Code (Text):
    f := (x,y) -> x^3 - 2xy


    contourplot(f(x, y), x = -20 .. 20, y = -20 .. 20, contours = [-2, -1, 0, 1, 2])
    It gave me an error saying

    Error, (in plot/iplot2d/levelcurve) could not evaluate expression
  2. jcsd
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