How to solve Error using + Arrays have incompatible sizes for this operation.

Hi everyone, i am trying to simulate the following function but I keep on getting the error message

Error uing + Arrays have incompatible sizes for this operation. I would be very grateful if anyone can help me solve the error. Thanks

function F = CSTR_T(x)

global F_i C_Ai T_i T_c C_A T

C_A = x(:,1);

T = x(:,2);

V = 7.929;

rho_A = 823.2;

rho_B = 1008;

C_pA = 120.7;

C_pB = 75.46;

A_o = 17000000000000;

delta_H = -90000;

UA = 360000;

E = 7236;

R = 8.314;

a(i)= F_i(i)./V;

gamma = rho_A*C_pA + rho_B*C_pB;

z = UA/(V*gamma);

b = delta_H/gamma;

F(1) = C_A - ((F_i(i)./V).*C_Ai(j)/(F_i(i)./V + A_o*exp(-E/(R*T))));

F(2) = T - ((F_i(i)./V.*T_i(k) + b*exp(-E/R*T)*C_A + (z+T_c))/(F_i(i)./V + z));

end

clear all

close all

clc

set(0,'defaultAxesFontName', 'Monospaced');

global F_i C_Ai T_i T_c C_A T

F_i = 50:0.076:80.3;

C_Ai = 0.1:0.05:20;

T_i = 20:0.2:99.7;

for i = 1:399

for j = 1:399

for k = 1:399

x0 = [0,0];

x = fsolve(@CSTR_T,x0)

end

end

end

Answer 1

[Joe Vinciguerra]

The arrays in the definition of either F(1) or F(2) (or both) are different sizes. For example:

A = 1:5;
B = 1:3;
A + B

Arrays have incompatible sizes for this operation.

If look at the line number included in the error message it will be easier to troubleshoot.

But also, I'm surprised the code you posted runs that far since you're not passing i, j, or k to the function.

[POKU GYASI]

Thank you very much for your answer. I appreciate.