Author 
Comment/Response 
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 1m>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!
Attachment: 1.JPG, URL: , 
