I am trying to nest functions in matlab, so as to calculate the deteminant of a

Question

I am trying to nest functions in matlab, so as to calculate the deteminant of a 9 x 9 matrix, using determinants of an 8 x 8, 7 x 7, and so on. I started small with a 3 x 3 and 2 x 2 matrix determinant functions, but am having trouble with the 3 x 3 calling the 2 x 2 determinant function. Thoughts? This is the program so far:

function d3 = det3(A)
x = 1;y = 1;i = 1;j = 1;sum = 0;z = 1;
for y = 1:3
for i = 2:3
for j = 1:3
if j == y
j = j + 1;
else
x = i - 1;
B(x,y) = A(i,j);
end
end
end
d = det2(B);
sum = sum + i*z*d;
z = z * (-1);
end
  
function d2 = det2(A)
d2 = (A(1,1)*A(2,2) - (A(1,2)*A(2,1));
end
d3 = sum;
end

Explanation / Answer

Hi, you can try my code:

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