function deter=DETERMINANT(A)
    [n,p]=size(A)
    if n == 1 then
        deter = A(1,1)
    else
        deter = 0
        for j=1:n
            deter = deter + A(1,j)*((-1)**(1+j))*DETERMINANT(MINEUR(A,1,j))
        end
    end
endfunction