Mirror plotting a curve

I would like to plot mirror the blue curve from the x=0 vertical axis

So to achieve something like that:

Is there any way of achieving that?

Answer 1

[John D'Errico]

You must have plotted the curve using a call like

plot(x,y,'-b')

But then, what would the following do?

plot(-x,y,'-b')

[ErikJon Pérez Mardaras]

thanks for your repply, but what I am looking for is for a general solution. What you said is a particular solution when you want to mirror plot relative to an X axis, but imagine the following.

Imagine for example I have this blue curve

And I want a mirror plot relative to the purple axis, to achieve this:

How could I achieve that?