i have a txt file with 'temp' and 'heat flux' and i need to use it to calculate final temp and optimum emissivity. my code runs fine but the output file is coming out blank?

C1 = 3.74177e8;

C2 = 1.43878e4;

sig = 5.67e-8;

T_static = 229.58;

Tval = fopen('radiative boundary.txt', 'r');

Tvalue = fscanf(Tval, '%f');

fclose(Tval);

T = Tvalue;

H = hvalue;

Temp_value = [];

optimum_emsvty = [];

Temp_value = Temp_value;

optimum_emsvty = optimum_emsvty;

for i = 1:length(H)

e0 = 0.0;

e1 = 1.0;

delt = 1;

while abs(delt) > 0.000001

e = (e0 + e1) / 2.0;

c = 500;

for j = 1:5

c = c - wall(c, i, T, H, e, sig, T_static) / derivative(@wall, c, 1e-6, i, T, H, e, sig, T_static);

end

powr = integral(@(lam) power(lam, C1, C2, e), 8, 12);

delt = powr - integral(@(lam) power(lam, C1, C2, 1), 8, 12);

if delt > 0

e1 = e;

elseif delt < 0

e0 = e;

end

end

c = double(c);

end

writematrix(optimum_emsvty,'Optimum_Emissivity.txt');

writematrix(Temp_value,'Final_Wall_Temperature.txt');

function powr = power(lam, C1, C2, e)

powr = (e * C1) / ((lam^5) * (exp(C2 / (lam * T_static)) - 1));

end

[Torsten]

You forgot to attach your input file.

[Tony]

You're initiallizing Temp_value and optimum_emsvty as empty, but not updating them in the calculations. So when you write to file, you're writing empty matrices and so the file is blank.

[Aditi]

i received this code from a student. what should i change?

[Torsten]

You should ask the student for the necessary input file "radiative boundary.txt" referenced in the line

Tval = fopen('radiative boundary.txt', 'r');

Further, as @Tony said, the lines

Temp_value = [];
optimum_emsvty = [];

initialize "Temp_value" and "optimum_emsvty" as empty arrays. The arrays are not modified in the sequel so that the commands

writematrix(optimum_emsvty,'Optimum_Emissivity.txt');
writematrix(Temp_value,'Final_Wall_Temperature.txt');

at the end of your code write blank files.

[Tony]

You'll have to ask that student, or the supervisor, what Temp_value and optimum_emsvty are supposed to do/mean. If you're lucky, they've written the calculations somewhere. Otherwise, you'll have to figure out the lines of code yourself.

[Aditi]

i have the input files for temperature and flux. what do i change?