I am having trouble creating a loop for inputs into a function

Question

Logan DiCerb 2022-7-11

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1757455-i-am-having-trouble-creating-a-loop-for-inputs-into-a-function

评论： Bharat Chandra Mukkavalli 2022-7-12

I have a MATLAB code and function that finds values needed for a turbojet analysis and here is the function I created and I am calling for a project:

[ST,S,Thrust] = dualspoolturbofan(M_0,mdot_0,T_0,p_0,pi_dmax,T_t4,eff_b,pi_b,h_PR,alpha,pi_cL,pi_c,pi_f,gamma_c,cp_c,e_cL,e_cH,gamma_t,cp_t,e_tL,e_tH,e_f,eff_mH,eff_mL,pi_n,pi_fn,p0_p9,gc);

My problem statement is to then plot the outputs vs M_0 (3v1 graph), while M_0 changes from (0.0,0.9,30) (30 values between 0.0 & 0.9), and T_t4 changes from 2800,3200,3400 (just those 3 values)

So 90 total changed inputs with the 30 Mach values and 3 temperature values. I am just stuck on what loops to create to satisfy this problem statement. Thanks so much!!

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Answer 1

Bharat Chandra Mukkavalli 2022-7-12

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Hi,

As I understand, you want to plot three graphs ST vs M_0, S vs M_0 and Thrust vs M_0 for different discrete values of T_t4.

You can run the following loops to achieve this:

M_0 = linspace(0, 0.9, 30);

titledlayout(3, 1);

for temp in [2800, 3200, 3400]

ST_vec = [];

S_vec = [];

Thrust_vec = [];

for m in M_0

[ST,S,Thrust] = dualspoolturbofan(m, ..., temp, ...);

ST_vec(end+1) = ST;

S_vec(end+1) = S;

Thrust_vec(end+1) = Thrust;

end

nexttile

hold on

plot(M_0, ST_vec);

plot(M_0, S_vec);

plot(M_0, Thrust_vec);

hold off

end

Refer to the link here on plotting multiple plots: https://in.mathworks.com/help/matlab/creating_plots/combine-multiple-plots.html

Hope this helps!

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Rik 2022-7-12

在 MATLAB Online 中打开

No, it does not. 'in' is not a valid Matlab syntax. You can easily check this by formatting your code as a code section, instead of an inserted example.

M_0 = linspace(0, 0.9, 30);
titledlayout(3, 1);
for temp in [2800 3200 3400]
Invalid expression. Check for missing multiplication operator, missing or unbalanced delimiters, or other syntax error. To construct matrices, use brackets instead of parentheses.

Error in connector.internal.fevalMatlab

Error in connector.internal.fevalJSON
    ST_vec = [];
    S_vec = [];
    Thrust_vec = [];    
    for m in M_0
        [ST,S,Thrust] =  dualspoolturbofan(m, ..., temp, ...);
        ST_vec(end+1) = ST;
        S_vec(end+1) = S;
        Thrust_vec(end+1) = Thrust;
    end
    nexttile
    hold on
    plot(M_0, ST_vec);
    plot(M_0, S_vec);
    plot(M_0, Thrust_vec);
    hold off
end     