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Student Support Forum: 'What's wrong with RegionPlot3D?' topicStudent Support Forum > General > Archives > "What's wrong with RegionPlot3D?"

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JackTsui
09/19/10 07:40am

My problems is as follows:

x,y,z are the three parameters,ranging from -1 to 1,(i.e., -1<=x<=1 and also for y,z)

x1 = 1 - x + y + z;
x2 = 1 + x - y + z;
x3 = 1 + x + y - z;
x4 = 1 - x - y - z;
m = Max[Abs[x], Abs[y], Abs[z]];

F = 2 + x1 Log[2, x1] + x2 Log[2, x2] + x3 Log[2, x3] + x4 Log[2, x4] - (1 + m)/2 Log[2, 1 + m] - (1 - m)/2 Log[2, 1 - m];

obviously, x1>0, x2>0, x3>0, x4>0, 1+m>0,and 1-m>0

I wanna draw a picture with F==0.2

so I employ the Function: RegionPlot3D as follows,

RegionPlot3D[x1 > 0 && x2 > 0 && x3 > 0 && x4 > 0 && 1 + m > 0 && 1 - m > 0 && 0.149 <= F<= 0.15, {x, -1, 1}, {y, -1, 1}, {z, -1, 1}, Mesh -> None, PlotPoints -> 50]

However, no picture has been depicted,I don't kown
what's wrong with this??

[enclosed is a correct picture runned by Matlab]

Hoping for your answer!
Thanks!



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