MATLAB: 3D surface plotting. Error (z must be a matrix)

3d plotinghomework

x_length=50;
for y_length=0:200;
z_length=y_length;
%[z,y]=meshgrid(z_length,y_length);
%i=0:200;
Hyp1=sqrt((x_length.^2)+(y_length.^2));
Hyp2=sqrt((Hyp1.^2)+(z_length.^2));
ctheta_i=y_length/Hyp2;
Lang_walldb=20*(1-ctheta_i).^2;
surf(Lang_walldb)
grid on
xlabel('y length');
ylabel('z length ');
zlabel('angular loss')
hold on
set(gca,'View',[-29,-22]);
end

Best Answer

x_length=0:50;
y_length=0:200 ;
[x_length,y_length] = meshgrid(x_length,y_length);
Hyp1=sqrt((x_length.^2)+(y_length.^2));
Hyp2=sqrt((Hyp1.^2)+(y_length.^2));
ctheta_i=y_length./Hyp2;  % edited as suggested my Madhan Ravi
Lang_walldb=20*(1-ctheta_i).^2;
surf(Lang_walldb)
shading interp 
grid on
xlabel('y length');
ylabel('z length ');
zlabel('angular loss')
hold on
set(gca,'View',[-29,-22]);
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