I am trying to plot the function as shown in figure above
where the red curve denote for V = 200*1.6*1e22 and the blue curve denotes for V = 285*1.6*1e22
clear all
close all
clc
syms phi
l = 50*1e9;
D = 200*1e9;
E = 80*1.6*1e22;
v = 1e+6;
h = 6.626*1e34/(2*pi);
V = 200*1.6*1e22;
ky = (2*pi/l).*sin(phi);
q_x = sqrt((E  V).^2./((h*v).^2  ky.^2));
% vpa(q_x,5)
T = cos(phi).^2./(1  cos(q_x.*D).^2.*sin(phi).^2);
ezpolar(T)
it works great but i want to show the plot only between the 90 < phi < 90 , i tried ezpolar(T,[pi/2 pi/2]) it gives the plot in region 90 to 90 but the empty region does also appear. How to remove that left half semicircular area where the plot is not there.
