3D plot using matlab

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

Answer 1

[Image Analyst]

z is complex. You must want to investigate why.

[A A]

yaa i know but how can that help me ?