Adding a line to a Pandas plot

Question

I'm currently tracking my internet speed and want to generate a plot of my measurements with a Timestamp, Upload value and Download value.

I'm using this to create the plot

df.plot(
    kind='line', 
    x=timestamp_column_name, 
    y=[download_column_name, upload_column_name],
    figsize=(12,5)
)

Generated plot:

Now I would like to add a line to this plot with the constant height of y=100000 but I can't figure out how to do this correctly. How should I do this with Pandas?

ImportanceOfBeingErnest · Accepted Answer · 2017-09-01 13:16:23Z

18

You can use axhline. Since df.plot() is a wrapper for matplotlib and returns the Matplotlib axes, which contain all the methods for interacting with the plot, it can be used straight forward as:

ax = df.plot( ... )
ax.axhline(y=100000)

edited Sep 1, 2017 at 13:16

answered Sep 1, 2017 at 11:34

ImportanceOfBeingErnest

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1 Comment

greg_data Over a year ago

I guess it would be useful to mention what's going on, namely that df.plot() returns the Matplotlib axes, which contain all the methods for interacting with the plot. After that ax.axhline() seems pretty self explanatory!

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