Index exceeds the number of array elements in a while loop

Hello everyone, I keep getting the classic error message of 'Index exceeds the number of array elements (169)'. Here is my code, it's a very simple while loop:

syms T h

T (h) = ((288.19-0.00649.*h));

h = linspace (7620,11000,169); %Every step is 20m change in altitude

D = vpa(T(h),4);

s = 1;

while s <= 169

rho(s) = 1.225*(D(h)/288.19)^((9.80665/(0.0065*286))-1);

s = s+1;

end

I really don't see where I've gone wrong. I have other while loops that follow the same structure and they work perfectly. Any help would be appreciated. Thanks in advance!

Answer 1

[David Hill]

No need for any loops. No need for symbolics.

h =  linspace (7620,11000,169);
D = 288.19-0.00649.*h;
rho= 1.225*(D/288.19).^(9.80665/0.0065/286-1);

[Juan Pardo Arazola]

Thanks! Works fine. Hadn't thought of not using a loop.