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plotting four variable using meshgrid for 3 variables, but i am getting error

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Zahid
Zahid 2023-8-31
Locked: Rena Berman 2024-6-5
Ran in:
t=0.2;
p=1;
for kx = -3:.1:3
q=1;
for ky = -3:.1:3
r=1;
for kz = -3:.1:3
energy_ary(p,q)= -2*t*(cos(kx)+cos(ky)+cos(kz));
z_ary(r)= kz;
r=r+1;
end
y_ary(q)= ky;
q=q+1;
end
x_ary(p)=kx;
p=p+1;
end
x = x_ary ;
y = y_ary ;
z = z_ary ;
[XX,YY,ZZ] = meshgrid(x,y,z);
EE = energy_ary' ;
surf(XX,YY,ZZ,EE) ;
Error using matlab.graphics.chart.primitive.Surface
Value must be a vector or 2D array of numeric type.

Error in surf (line 145)
hh = matlab.graphics.chart.primitive.Surface(allargs{:});
hold all

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Walter Roberson
Walter Roberson 2023-8-31
meshgrid with 3 inputs always returns 3 dimensional outputs (unless the third input just happens to be scalar.) So your XX, YY, and ZZ are all going to be 3D. But surf() requires that the first two coordinate systems be either vector or 2D, and that the third coordinates be 2D.
surf() is not suitable for creating 3D cuboid volumes with a value for each interior voxel.
If you have three independent input variables and one dependent output variable, then you should consider: slice or isosurface or volshow

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