how to solve this error horzcat Dimensions of matrices being concatenated are not consistent?

hi all, how can i solve this problem

Error using horzcat
Dimensions of arrays being concatenated are not consistent.
Error in  (line 131)
temp3=max([U3 u3max]);

in this code?

u1max=0; u2max=0; u3max=1; 
for i=1:N-1 
    j=N-i;
    
y=[g1(j+1) g2(j+1) g3(j+1) g4(j+1) g5(j+1) g6(j+1)];

k1=h*costate(y,A1,A2,A3,S(j+1),I(j+1),C(j+1),B(j+1),u1(j+1),u2(j+1),u3(j+1),mu_h,beta_1,beta_2,phi,K,delta,q,d1,eta_1,epsilon_1,alpha,eta_2,l,epsilon_2,omega,r,mu_b,sigma,K_p);
k2=h*costate(y-0.5*k1,A1,A2,A3,S(j+1),I(j+1),C(j+1),B(j+1),u1(j+1),u2(j+1),u3(j+1),mu_h,beta_1,beta_2,phi,K,delta,q,d1,eta_1,epsilon_1,alpha,eta_2,l,epsilon_2,omega,r,mu_b,sigma,K_p);
k3=h*costate(y-0.5*k2,A1,A2,A3,S(j+1),I(j+1),C(j+1),B(j+1),u1(j+1),u2(j+1),u3(j+1),mu_h,beta_1,beta_2,phi,K,delta,q,d1,eta_1,epsilon_1,alpha,eta_2,l,epsilon_2,omega,r,mu_b,sigma,K_p);
k4=h*costate(y-k3,A1,A2,A3,S(j+1),I(j+1),C(j+1),B(j+1),u1(j+1),u2(j+1),u3(j+1),mu_h,beta_1,beta_2,phi,K,delta,q,d1,eta_1,epsilon_1,alpha,eta_2,l,epsilon_2,omega,r,mu_b,sigma,K_p);

y=y-(1/6)*(k1+2*k2+2*k3+k4);

g1(j)=y(1); g2(j)=y(2); g3(j)=y(3); g4(j)=y(4); g5(j)=y(5); g6(j)=y(6);

w=((beta_1*I)+((beta_2*C)+(phi*B)/(K+B)));

U1=((eta_1*g3(j)*I(j))+(eta_2*C(j)*g4(j))-(((eta_1*I(j))+(eta_2*C(j)))*g5(j)))/P1;
U2=(sigma*B(j)*g6(j))/P2;
U3=(((w+mu_h)*g2(j)*S(j))-((w+mu_h)*g1(j)*S(j))+((epsilon_1*I(j))+(epsilon_2*C(j)))*g6(j))/P3;
temp1=min([U1 u1max]); 
u1(j)=max([0 temp1]); 
temp2=min([U2 u2max]); 
u2(j)=max([0 temp2]); 
temp3=max([U3 u3max]); 
u3(j)=min([0 temp3]); 
end

ps. i am new in matlab.

Cheers!

[KSSV]

temp3=max([U3 u3max]); 

Check the dimensions of U3 and u3max...they should be row vectors to join them....it seems they are not in your case.

[Prabandari Sonia Moerti]

how do i check the dimensions? im sorry im so new in matlab

Answer 1

[KSSV]

Learn about debugginf a code here: https://in.mathworks.com/help/matlab/matlab_prog/debugging-process-and-features.html

You can get the dimension using the function size. In your case one is row vector and other is column vector so you are getting error.

Example:

A = [1 2] ;
B = [3 ;4] ;
AB = [A B]

Error using horzcat
Dimensions of arrays being concatenated are not consistent.

[Prabandari Sonia Moerti]

thankyou, it really helps :)