Asked by Kevin Tai
on 29 Oct 2019

Hi there, still learning here. I have a small question where how do I connect all the points with a line? I can't seem to get it even after using different functions.

Any help is greatly appreaciated!

c = 0.2;

Re = 386639;

V = 27.78;

b = 0.8:0.02:1.2;

alpha_Lmax = 17.2;

alpha_Lzero = -4.3;

C_lmax = 1.508306;

C_lzero = 0.4527213;

c_d0 = 0.01188282;

rho_0 = 1.225;

rho = 1.202;

R = 287.057;

mew_0 = 1.789e-5;

mew = 1.7284e-5;

alpha = 0;

v = 1.4370e-5;

a_airfoil = C_lmax/(alpha_Lmax-alpha_Lzero);

for i = 1:length (b)

a_wing = a_airfoil/(1+(57.3*a_airfoil)/(pi*0.7*(b(i)/c)));

C_L = a_wing*(alpha-alpha_Lzero);

L = 0.5*rho*(V^2)*b(i)*c*C_L;

C_Di = (C_L^2)/(pi*0.7*(b(i)/c));

C_D = c_d0 + C_Di;

ratio = C_L/C_D;

plot (b(i),ratio,'x')

hold on

end

grid on

xlabel('Span (m)')

ylabel('CL/CD')

title('CL/CD vs Span')

Opportunities for recent engineering grads.

Apply Today
## 2 Comments

## Rik (view profile)

## Direct link to this comment

https://ww2.mathworks.cn/matlabcentral/answers/488037-can-t-connect-all-the-dots-with-a-line#comment_761200

## Kevin Tai (view profile)

## Direct link to this comment

https://ww2.mathworks.cn/matlabcentral/answers/488037-can-t-connect-all-the-dots-with-a-line#comment_761206

Sign in to comment.