Adding small slope indicating triangles to my Convergence Graph

Hi everybody

I have a simple question, but I could not figure it out how to do it simply. I have a convergence plot and I would like to show the slope of the line on a small triangle like the one in the photo below.

Any help would be appreciated, thanks :)

Answer 1

[dpb]

Just use *line* (after 'hold on') to add the lines then *text* to annotate