k = 1;
T = 1;
num = k;
den = [T, 1];
sys2 = tf(num, den);
present(sys2);

figure(2);
step(sys2);
grid on;
hold on;
'Press a key';
pause;

k = 2;
T = 1;
num = k;
den = [T, 1];
sys2 = tf(num, den);
present(sys2);

figure(2);
step(sys2);
grid on;
hold on;
'Press a key';
pause;

k = 3;
T = 1;
num = k;
den = [T, 1];
sys2 = tf(num, den);
present(sys2);

figure(2);
step(sys2);
grid on;
hold on;
'Press a key';
pause;