clear;
clf;

x = [-2 : 0.01 : 2]
y = x .^ 2

% now i am going to make a pic

figure(1)
plot(x,y, 'ro-.')
xlabel('x-axis')
ylabel('y-axis')
title('my first matlab graph')

hold on

xx = [0 1]
yy = [1 2]
plot(xx,yy)

figure(2)
xxx = [x(3) x(17) 11]
yyy = [1 2 3]
plot(xxx,yyy,'g*')