How to draw a figure with x axis of a(i) and y axis of a(i+1)？

Suppose I have a array of a(i), how do I draw this figure?

Answer 1

[Walter Roberson]

plot(a(i), a(i+1))

You will not see much unless your i is a vector of values.

Perhaps what you want to ask about is

plot(a(1:2:end), a(2:2:end))

[xingjian yang]

Thank you! How can't I figure it out :)