left side are not compatible with the size of the right side.

>> A=[-8,5,-2,0;-5,2,1,-2;10,-8,6,-3;3,-2,2,0];
>> b=[-29,-26,25,20];
>> cramer(4)

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

Error in cramer (line 7)

B(:,i) = b;

This is my cramer function:

function cramer(n)
    A=[];
    b=[];
    x=[];
    for i=1:n
        B=A;
        B(:,i) = b;
        xi=det(B)/det(A);
        x=[x,xi];
    end
    disp(x)    
end

[Jia Hong Loh]

is this question too hard for you guys?

[Adam Danz]

Actually, you never asked a question. ;)

Answer 1

[Adam Danz]

Your cramer function defines b as

b=[];

The loop within that function tries to store the empty value of b in B(:,i) which is of size [1x1] but b is of size [0,0] because it's empty.

B(:,i) = b;

That's why the error message reads,

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