MATLAB: These two codes produce different graphs? How to make the second graph be like the first

Question

Why these two codes produce different graphs? How can I make the second graph be like the first?

1st:

    t=0:0.3:10;
step(c2d(tf(1,[1 1]),0.3),t);

2nd:

t=0:0.3:10;
[y,t]=step(c2d(tf(1,[1 1]),0.3),t);
plot(t,y)

Answer 1

Fangjun's correct. To get the same plot, use stairs:

stairs(t,y)

HTH,

Arnaud