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3D plot question


Dear Mathgroup,

    When I plot a 3D plot in mathematica, I found that some part of the
surface has been cut off in the graph. For example,

    z = x^5*y

    Plot3D[z, {x, -1, 1}, {y, -1, 1}, PlotPoints -> 40,

Mesh -> False, BoxRatios -> {1, 1, 0.4}]

Mathematica plot for z values only in the range -0.2 to 0.2. Actually
when x=1, y=1, z value will be 1. But in the graph, the surface goes
flat for z>0.2.Why? How can I get the graph for full range of z?

   

Best Regards,

Tun Myint Aung
Graduate Student
National University of Singapore
E1A #02-18
Kent Ridge, 119260, Singapore
E-mail g0202015 at nus.edu.sg <mailto:g0202015 at nus.edu.sg>



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