Bug summary

Frommatplotlib/ipympl#405 it seems that if you repreatedly run a cell withplt.figure(num=1) and then plot a new line you will only ever have a plot with one line on it.

Code for reproduction

Cell 1

%matplotlibnbaggimportnumpyasnpimportmatplotlib.pyplotaspltx=np.linspace(-np.pi/2,np.pi/2)i=0

Cell 2 (run this one repeatedly)

plt.figure(num=1)plt.plot(x,np.sin(x*i))i+=1

Actual outcome

Expected outcome

Do the equivalent from ipython:

importmatplotlib.pyplotaspltimportnumpyasnpplt.ion()x=np.linspace(-np.pi/2,np.pi/2)# each iteration of loop represents a cell re-executioni=0defrun_cell():globaliplt.figure(num=1)plt.plot(x,np.sin(x*i))i+=1

Additional information

No response

Operating system

No response

Matplotlib Version

3.5.1

Matplotlib Backend

nbagg

Python version

3.9.7

Jupyter version

6.4.4

Installation

pip