Index in position 2 exceeds array bounds (must not exceed 5).

I'm trying to write a code to evaluate a system of equations, but keep getting the above error. Any help would be greatly appreciated!

function X = GaussPivot(A, b, n)

C = [A b];
scale = max(max(C));
C = (1/scale) * C;


for k = 1 : (n-1)  %partial pivoting
    p = k;
    big = abs(C(k,k));
    for ii = (k+1) : n
        if abs (C(ii,k)) > big
            big = abs(C(ii,k));
            p = ii;
        end
    end
        if p ~= k
            for jj = k : (n+1)
                dum = C(p,jj);
                C(p,kk) = C(k,jj);
                C(k,jj) = dum;
            end
        end
        
    % forward elimination
    
    for i = (k+1) : n
        factor = A(i,k) / A(k,k);
        for j = (k+1) : (n+1)
            A(i,j) =  A(i,j) - (factor * A(k,j));
        end
    end
end

% Back substitution 

X(n) = A(n,n+1) / A(n,n);
for i = (n-1) : 1 : -1
 SUM = A(i,n+1);
    for j = i+1 : n
        SUM = SUM - (A(i,j) * X(j));
    end
  X(i) = SUM / A(i,j);
end

end
      

[SL: formatted question as text not code]

[Carrie Thomas]

Just for reference, A is a 5x5 and b is a 1x5

[Jesus Sanchez]

What is your value for n? If its larger than 5, this code gives error, as A is 5x5 matrix. If this is not the case, could you specify in which line is the error located?

[Carrie Thomas]

It says the error is in line 30

Answer 1

[Steven Lord]

Rather than trusting your user to enter a value of n compatible with the sizes of A and b, compute it from A and/or b using size.

[Carrie Thomas]

I originally had the value of n calculated, but it gives the same error.