Student Support Forum: 'Plot3D min and max errors?' topicStudent Support Forum > General > "Plot3D min and max errors?"

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 Author Comment/Response Prometheus 10/04/03 07:23am Hello, I am attempting to plot the function f(x.y)=xy^2-6x^2-3y^2 and am receiving rather vexing error messages concerning the mins and maxs of my function. For instance: Plot3D[xy^2-6x^2-3y^2, {x,-1,1}, {y,-1,1}] 2 2 2 xy - 6 x - 3 y is neither a machine-size real number at {x, y}={-1., -1.} nor a list of a real number and a valid color directive. More… 2 2 2 xy - 6 x - 3 y is neither a machine-size real number at {x, y}={-0.916667, -1.} nor a list of a real number and a valid color directive. More… 2 2 2 xy - 6 x - 3 y is neither a machine-size real number at {x, y}={-0.833333, -1.} nor a list of a real number and a valid color directive. More… Further output of Plot3D::plnc will be suppressed during this calculation. More… 2 Function value -9. + xy at grid point xi = 1, yi = 1 is not a real number. More… 2 Function value -8.52083 + xy at grid point xi = 1, yi = 2 is not a real number. More… 2 Function value -8.08333 + xy at grid point xi = 1, yi = 3 is not a real number. More… Further output of Plot3D::gval will be suppressed during this calculation. More… I am aware that the function is rather simplistic, and that my syntax is correct. Why am I receiving these error messages? URL: ,

 Subject (listing for 'Plot3D min and max errors?') Author Date Posted Plot3D min and max errors? Prometheus 10/04/03 07:23am Re: Plot3D min and max errors? Henry Lamb 10/08/03 00:19am
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