Array indices must be positive integers or logical values.

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Alexander Sutherland
评论： Star Strider 2019-9-12
Not really sure what I did wrong. I think it's my Rho list but I'm honestly unsure. Any input is greatly appreciated :)
C_L = 0.5;
C_D = 0.02;
L= 600; %lb
AR = 480; %ft^2
Alt = 12000; %ft
Angle_Climb = (C_D/C_L)*180/pi; %degrees
Rho =[0.00164779,0.00167423,0.00170099,0.00172808,0.00175549,0.00178324,0.00181132,0.00183974,0.00186850,0.00189760,0.00192704,0.00195684,0.00198698,0.00201748,0.00204834,0.00207956,0.00211114,0.00214308,0.00217539,0.00220808,0.00224114,0.00227457,0.00230839,0.00234259,0.00237717];
Rng = 0;
V_test = [];
V_y = [];
V_x = [];
t = [];
d=[];
for k=1:25
V = (2.*L./(Rho(k).*AR.*C_L)).^(1./2);
V_test(k) = V;
V_y(k) = V_test(k).*sin(0.04);
V_x(k) = V_test(k).*cos(0.04);
t(k) =500./V_y(k);
d(k) = V_x(k)./t(k);
end
display(V_test)

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采纳的回答

Star Strider
Star Strider 2019-9-12
The code you posted runs for me without error.
What line is throwing the error when you run it?
  2 个评论
Alexander Sutherland
Alexander Sutherland 2019-9-12
I realized that I had to use disp() instead of display() to display the array. Thanks for the help!
Star Strider
Star Strider 2019-9-12
As always, my pleasure!
The display function should work:
display(pi)
Do you have a variable called display? To find out, run this:
q = which('display','-all')
You should only get a long list of results that begin with:
q =
187×1 cell array
{'built-in (C:\Program Files\MATLAB\R2019a\toolbox\matlab\lang\display)' }
If the first entry is:
display is a variable.
you’ve found the problem. The solution is to rename the variable to something that doesn’t overshadow the name of any MATLAB function.

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