clear

format compact

% Matrix elements
a = 1;
b = 2;
c = 2;
d = 1;

% use a function defined in a dedicated file
de1 = determ(a, b, c, d)

% use local function defined at the bottom of the script
de2 = determ2(a, b, c, d)

% define anonymous function accepting four arguments
determ3 = @(a, b, c, d) a*d - b*c;

% define anonymous function accepting two arguments
determ4 = @(a, b) a*d - b*c;

% cnhange the parameters and compare four functions
c = 1;
d = 3;

de1 = determ(a, b, c, d)

de2 = determ2(a, b, c, d)

de3 = determ3(a, b, c, d)

de4 = determ4(a, b)

% local function definition
function de = determ2(a, b, c, d)
    de = a*d - b*c;
end