3D plot using matlab

Question

A A 2013-11-25

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/107510-3d-plot-using-matlab

评论： A A 2013-12-2

Hey..I'm trying to plot the following code but i keep getting this error: (??? Error using ==> surf at 78 Z must be a matrix, not a scalar or vector.)I tried using mesh i got the same error and whe i tried using plot3 it only resulted in straight line plot and not 3D..Help !!

%%Defining givens:
f= 300e6; %%Chosen frequency
c= 3e8; %%Free space
lambda= c./f; %%Wavelenght
l_2=lambda./2;
k= (2.*pi)./l_2; %%Wave number
Io=5; % Chosen maximum value of the current
eighta=377; % Intrinsic impedance (free space)
r=l_2/(2.*pi); % Distance
h= 0:1:100; %%Variable height from the ground
L=1.25*l_2; % Dipole length
theta= 2*pi; %%Computing the requirements:
%%Electric field:
   A= (k.*L.*Io.*exp(-1i.*r.*k))./(4.*pi.*r);
   B= 2.*(cos(cos(theta).*k.*h));
  E_F= eighta.*1i.*(A).*sin(theta).*(B);
[x,y,z]=sph2cart(h,theta-pi/2,E_F); % Converting to cartesian coordinates
% Generating 3D plot
surf(x,y,z) % Generating 3D plot
colormap(JET);
title ('Electric Field in 3D plot')
legend ('Heigth','Theta','Electric Field')
rotate3D on
axis image