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what to do when array indicies exceed for , FOR loop comparision for below , trying to plot density of atmosphere, how to do the comparison ?

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SL 2021-9-24

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1460289-what-to-do-when-array-indicies-exceed-for-for-loop-comparision-for-below-trying-to-plot-density

评论： Walter Roberson 2021-9-25

采纳的回答： Walter Roberson

在 MATLAB Online 中打开

h(1) = 0;
T(1) = 273.15;
p(1) = 101.2;
for t = 1:328084
    
    if h(t)<[11000]
        T(t+1) = 15.04 - 0.00649.*h(t);
        p(t+1) = 101.29 .*((T(t) + 273.15) /288.08).^5.256;
    elseif [11000]> h(t) && h(t)<=[25000]
        T(t) = -56.46;
        p(t+1) = 22.65.*e^(1.73-0.000157.*h(t));
    elseif h(t)>[25000]
        T(t) = -131.21+0.00299.*h(t);
        p(t+1) = 2.488 .* ((T(t) + 273.15)/216.6).^-11.388;
        
    end
    
    rho_h(t) = p(t) ./(0.2869 * (T(t) + 273.15))   
    
    
end
figure(1)
plot(T,h)
grid on 
legend on
figure(2)
plot(rho_h, h)
grid on
legend on

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采纳的回答

Walter Roberson 2021-9-24

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1460289-what-to-do-when-array-indicies-exceed-for-for-loop-comparision-for-below-trying-to-plot-density#answer_794509

在 MATLAB Online 中打开

h(1) = 0;

That is the only place you assign to h

if h(t)<[11000]

but you need h to be 328084 elements by the end of the loop.

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SL 2021-9-25

编辑：SL 2021-9-25

perfect thank you very much highly appreciate it

Walter Roberson 2021-9-25

please recheck rho_h(1) which is not assigned a value.

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