Can someone tell me why my graph isn't plotting?

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Kane Patrick Bobier
Kane Patrick Bobier 2020-10-23
评论： Star Strider 2020-10-23
I am trying to plot Coefficient of Drag (Cd) and Coefficient of Lift (Cl) vs. Angle of Attack (a). The code doesn't have any errors but nothing is boing plotted. My for loop produces the Cd and Cl values that I need. Can someone check my code?
%area
A = 0.152 * 0.3;
a = 0:5:50;
Pd = [
0.65,
0.65,
0.64,
0.59,
0.55,
0.53,
0.49,
0.43,
0.38,
0.33,
0.26
];
Fl = [
-17.23,
-4.6,
6.25,
13.37,
12.54,
13.82,
17.24,
19.51,
21.88,
22.83,
19.56
];
Fd = [
5.07,
5.41,
6.79,
10.23,
12.42,
16.46,
19.69,
23.38,
27.1,
30.02,
3.35
];
for i = 1:numel(Pd)
Cl = (Fl(i)/(Pd(i)*A))
Cd = (Fd(i)/(Pd(i)*A))
end
plot(a, Cl);
hold on;
grid on;
plot(a, Cd);
hold on;
grid on;
xlabel('a - Angle of Attack');
ylabel('Cl-(Coefficient of Lift) and Cd-(Coefficicent of Drag)');
title('Coefficients of Lift and Drag vs. Angle of Attack');

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采纳的回答

Star Strider
Star Strider 2020-10-23
Subscript ‘Cl’ and ‘Cd’ in the loop:
Cl(i) = (Fl(i)/(Pd(i)*A))
Cd(i) = (Fd(i)/(Pd(i)*A))
.

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