MATLAB: Is the functions not plotting a line

grapgMATLAB

My equations is working since i can manually change the variable to obtain different Vbar and Abar values, but it can't plot my graph. I have done this before so i dont know why its not working now. I attached the m' file and is also posting a screen shot.

Best Answer

Change the lines in your code like this

Wcd=(s.*Wab.*(s+sin(theta)))./(1+s.^2+2.*s.*sin(theta));
                           %^ put a dot here

                           
Acd=(Wab.^2.*s.*cos(theta).*(1-s.^2))./((1+s.^2+2.*s.*sin(theta)).^2);
                                    %^ put a dot here

Read about element-wise operators: https://www.mathworks.com/help/matlab/matlab_prog/array-vs-matrix-operations.html

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MATLAB: How to define a function that evaluates in input

function y=T(theta_Degree)
theta=theta_Degree*pi/180;
y=[cos(theta)^2 sin(theta)^2 2*cos(theta)*sin(theta);sin(theta)^2 cos(theta)^2 -2*cos(theta)*sin(theta);-cos(theta)*sin(theta) cos(theta)*sin(theta) cos(theta)^2-sin(theta)^2];
end

Then type in command line

T(40)

and see the results.

MATLAB: How to plot this

You have to vectorise your expressions, then decide how you want to plot your data:

theta=0:10:90;
n= 1.6+3i
e1=1-(((n.^2-(sin(theta)).^2 ).^0.5-cos(theta))./((n.^2-sin(theta).^2).^0.5+cos(theta))).^2;
e2=1-(n.^2-cos(theta)-(n.^2-(sin(theta)).^2).^0.5./(n.^2-cos(theta)+(n.^2-(sin(theta)).^2).^0.5)).^2;
rho= (e1-e2)./(e1+e2);
figure(1)
subplot(3,1,1)
plot(theta,real(rho))
grid
title('\Re \rho')
subplot(3,1,2)
plot(theta,imag(rho))
title('\Im \rho')
grid
subplot(3,1,3)
plot(theta, abs(rho))
title('|\rho|')
grid

Best Answer

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MATLAB: How to define a function that evaluates in input

MATLAB: How to plot this

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