Why is my functions not plotting a line?

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.

Answer 1

[Ameer Hamza]

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

Answer 2

[Setsuna Yuuki.]

you need add one point

Wab=9.42;
d=0.12;
s=0.1; % 0.3, 0.6 & 0.9
theta=0:0.1:6.28

Wcd=(s.*Wab.*(s+sin(theta)))./(1+s.^2+2.*s.*sin(theta)); %add point before /
Vbar=Wcd.*d

Acd=(Wab.^2.*s.*cos(theta).*(1-s.^2))/((1+s.^2+2.*s.*sin(theta)).^2);
Abar=Acd.*d

plot(theta,Vbar), grid on;
xlabel('theta(rad)'), ylabel('Acceleration of bar CD(rad/s^2)')
title('Acceleration vs theta @ s=0.1')