Shifted points in Plot Function

Hi, I am trying to plot a figure, put the first point isn't located on the y-axis coordinate (shifted to right), see the attachment. Can any one please tell me why? Thanks

[Alsabbagh Amro]

As seen

Answer 1

[KSSV]

use axis tight after plotting.

[Alsabbagh Amro]

Could you please give an example? Thanks

[KSSV]

You plot your figure....and then use axis tight