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

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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?


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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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