Annotate every nth point on plot with Matplotlib

Question

I have the following code to annotate a plot made with matplotlib:

for i,j in data.items():
   ax.annotate(str(j), xy=(i, j))

This annotates every point on a very point dense plot. Is there anyway to only put an annotation or label on every nth point?

You could add an arbitrary counter that gets increased every iteration. And you put that ax.annotate(...) inside an if counter % 50 == 0 to annotate every 50th point. The counter could be added manually or by using enumerate. — Niklas Mertsch
– Niklas Mertsch, Commented May 30, 2018 at 17:27

Niklas Mertsch · Accepted Answer · 2018-05-30 17:30:25Z

2

As suggested in my comment:

for count, (i,j) in enumerate(data.items()):
    if count % 50 == 0:
        ax.annotate(str(j), xy=(i, j))

Replace 50 with a different integer if you don't want to annotate every 50'th point.

answered May 30, 2018 at 17:30

Niklas Mertsch

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