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L=4;,B=0.5;,D=0.5;,x=-2:0.02:2;,z=-2:0.02:2;
[X,Z]=meshgrid(x,z);
y1=(B/2)*(1-(2*x/L).^2).*(1-(z/D).^2);,y2=(-B/2)*(1-(2*x/L).^2).*(1-(z/D).^2);
surfc(x,z,y1);
Error using surfc
The surface Z must contain more than one row or column.
surfc(x,z,y2);
I want this, but it is not work.

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Dyuman Joshi
Dyuman Joshi 2023-10-5
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You need to use X and Z instead of x and z for defining y1 and y2.
And you can define y2 = -y1.
L=4;B=0.5;D=0.5;x=-2:0.02:2;z=-2:0.02:2;
[X,Z]=meshgrid(x,z);
% v v
y1=(B/2)*(1-(2*X/L).^2).*(1-(Z/D).^2);
y2=-y1;
surfc(x,z,y1);
surfc(x,z,y2);

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