Unable to perform assignment because the indices on the left side are not compatible with the size of the right side.

Here is the arrays i'm using

X=Distancia; % Distancia is 1 x 211 double
Y=Topo; % Topo is 1 x 211 double
lluvia = mms*135900 % lluvia is 211 x 1 double
L = lluvia

Fy=gradient(Y);
FY=sum(Fy)/length(Fy);
Y2=Y;
a=1;

and I want run the follow cycle. Is to calculate Darcy's law for infiltration.

while FY<0 
    for i=1:length(X)-1
        H(i)=Y2(i+1)-Y2(i);  
        A(i)=H(i)*L;
        Fy2(i)=(Y2(i+1)-Y2(i))/(X(i+1)-X(i)); 
        
        if and(X(i) >= 1, X(i) <= 91) %andosoles 
            K=1e-4
        
        if and (X(i) > 112, X(i) <= 141) %luvisol
            K=1e-10
           
        else
            K=1e-8
            
        end
        end
    

        
        Q(i)=A(i).*-K.*Fy2(i);
        Y2(i)=Y2(i)-(Q(i)/A(i));
        Y2(i+1)=Y2(i+1)+(Q(i)/A(i)); 
    end 
    Fy3=gradient(Y2)
    Y3(:,a)=Y2;
    FY=sum(Fy3)/length(Fy3);
    a=a+1; 
    b=floor(a/1000)*1000; 
   
    if a==b  
    plot(X,Y2)
    pause(0.02)
    end 
end

[KSSV]

Error on which line? You have not provided the complete code and inputs are missing.

[Marcos Granados Flores]

Sorry. I've noticed and updated the post. that message is all that matlab says to me. :(

[KSSV]

You need to rething on your code...Fy is an array and you have use

while Fy < 1 

[Marcos Granados Flores]

Thank you but keep saying the same error message

"Unable to perform assignment because the indices on the left side are not compatible with the size of the right side"

[KSSV]

You have not mentioned the line number.

The code runs without any error in my pc. Forget the ouput.