You can do this all in one m-file. Have an m-file called test_square.m and in there have both the test harness (calling function) and the Square function. It will look similar to this:
function test_square()
A = 1:10;
B = Square(A);
plot(A, B, 'ro-');
grid on;
function B = Square(A)
for k = 1 : length(A)
B.......
.... and so on.
In the loop you square each element of A because this is exactly what it told you to do. Then just click the green triangle, or type test_square on the command line, to run the program.
