How to make output X Y graph like the picture?

can you help me, How to make output X Y graph like the picture?

Answer 1

[Mathieu NOE]

hello

you simply have to remember that vertical lines need you to duplicate the x value (with different y values of course)

like in this example x = 2 for both y = 1 and 2

x = [1 2 2 3];
y = [1 1 2 2];
plot(x,y,'linewidth',5);
xlim([0 4]);
ylim([0 3]);

[Mathieu NOE]

hello

problem solved ?