Interactive matplotlib plots in jupyter notebook

Question

The following snippet works as expected in ipython console:

> anaconda3/bin/ipython3
In [1]: import matplotlib.pyplot as plt
        import pandas as pd
        import numpy as np
In [2]: plt.ion()
In [3]: pd.Series(np.sin(np.arange(0, 10, 0.1))).plot() # plot window appears
In [4]: pd.Series(np.cos(np.arange(0, 10, 0.1))).plot() # second line is drawn in the same window

At no point is the terminal blocked. How to get the same behavior in Jupyter notebook? That is, an external interactive plot window that can be drawn onto incrementally from the notebook.

The same snippet displays no plots from the notebook. Executing plt.show() will display external window, but will block execution until window is closed.

Thanks in advance.

qsd · Accepted Answer · 2017-06-10 17:52:15Z

10

Turns out %matplotlib magic is needed in the notebook even if no backend switch is required, after which notebook does behave the same as console. E.g., execute this as the first cell in a notebook:

%matplotlib
import matplotlib.pyplot as plt
plt.ion()

edited Jun 10, 2017 at 17:52

answered Sep 10, 2016 at 17:06

qsd

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3 Comments

qsd Over a year ago

@Minato added example.

qsd Over a year ago

@garyp no, not as far as I remember, hence the question. I think I found it accidentally by using the %magic for unrelated things.

Pablo Ruiz Ruiz Over a year ago

Where is the example added? I am still having the plot in a new figure outside the notebook

Never Too Old To Learn · Accepted Answer · 2020-12-01 01:18:28Z

1

Magic command %matplotlib makes jupyter notebook use Qt5Agg interactive back end.

answered Dec 1, 2020 at 1:18

Never Too Old To Learn

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Comments

Pak Uula · Accepted Answer · 2021-07-06 17:15:31Z

0

To imitate a blocking call to plt.show() with interactive backend you need to wait until your figure is active.

# provided interactive backend
# e.g. %matplotlib qt5
fig = plt.figure()

plt.show()

try:
    while fig.number in plt.get_fignums():
        plt.pause(0.1)
except:
    plt.close(fig.number)
    raise

The exception case closes the figure's window when a user presses Interrupt the kernel (aka Stop) button in Jupyter Notebook.

answered Jul 6, 2021 at 17:15

Pak Uula

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