% Section 7





% Sample solution to calculate determinant of 3-by-3 matrix

function result = myDeterminant(x)

% result is the determinant of matrix x.  
% a1, a2, a3 are the minor matrices.



    a1(1,1) = x(2,2);

    a1(1,2) = x(2,3);

    a1(2,1) = x(3,2);

    a1(2,2) = x(3,3);

    

    a2(1,1) = x(2,1);

    a2(1,2) = x(2,3);

    a2(2,1) = x(3,1);

    a2(2,2) = x(3,3);

    

    a3(1,1) = x(2,1);

    a3(1,2) = x(2,2);

    a3(2,1) = x(3,1);

    a3(2,2) = x(3,2);

    

    result = x(1,1)*det(a1) - x(2,2)*det(a2) + x(3,3)*det(a3);





% Alternate sample solution to calculate determinant of 3-by-3 matrix


function output = myDeterminant(x)

% output is the determinant of matrix x.



output= x(1,1)*det(x(2:3,2:3)) ...

        - x(1,2)*det(x(2:3,[1 3])) ...

        + x(1,3)*det(x(2:3,1:2));