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

Question

Ubaid Ullah 2019-4-12

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/455921-3d-surface-plotting-error-z-must-be-a-matrix

编辑： KSSV 2019-4-12

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

2 个评论
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madhan ravi 2019-4-12

you never seem to use z & y after meshgrid() call , re-examine why you used it in the first place

Walter Roberson 2019-4-12

Nothing in your calculation is a vector, let alone a matrix. Your Lang_walldb is always going to be a scalar at the point you do the surf()

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Answer 1

KSSV 2019-4-12

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/455921-3d-surface-plotting-error-z-must-be-a-matrix#answer_370310

编辑：KSSV 2019-4-12

在 MATLAB Online 中打开

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]);