Plotting a step function in Mathematica

Question

I'm trying to plot a couple of UnitStep functions, but for some reason, Mathematica won't plot the whole function - Just the top (it doesn't look like a step, more like a line).

How do I tell mathematica to plot it all?

Answer 1

An alternative to setting Exclusions -> None is to set ExclusionsStyle -> {style} if you want to draw the line segments connecting the discontinuities in a different style from the rest of the curve. For example

Plot[Round[n], {n, 0, 5}, ExclusionsStyle -> {Dashed}]