Pyplot .plot function generates immediate graph. plt.plot() seems to do nothing

Question

For some reason plots are generated when i run a single line (F9 in Spyder). So in the sequence hereunder first a line plot is generated. The second line generates an empty plot,but with the y-label,and the plt.show() does nothing. Yesterday i tried making a very simple animation. used export to file. I since then made a total new installation. Reinstalled Anaconda I am using Anaconda, Python 3.9.7 matplotlib 3.4.3, Ipython 7.29.0,spyder 3.9.7

What am I missing?

plt.plot([1, 2, 3, 4])  #this line makes a simple line plot
plt.ylabel('some numbers') #executing thins line makes a new empty plot with the label
plt.show()  #nothing happens

enter image description here

IPython consolesettings for graphics backend is "Inline". The matplotlib backend used is matplotlib.get_backend() => module://matplotlib_inline.backend_inline' — Berend
– Berend, Commented Jan 18, 2022 at 22:43

Carlos Cordoba · Accepted Answer · 2022-01-19 04:02:04Z

1

(Spyder maintainer here) What you described is the right behavior for the Inline backend, which (as you discovered) is the one you're using.

To change it and create a plot by evaluating different commands one at a time, you need an interactive backend. To set one, please go to the menu

Tools > Preferences > IPython console > Graphics

and select Automatic in the Backend section. After that, you'll be shown a dialog asking you to restart your kernels, to which you need to agree (if that's not the case, just close Spyder and restart it again).

answered Jan 19, 2022 at 4:02

Carlos Cordoba

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Comments

DanielGzgzz · Accepted Answer · 2022-01-18 16:45:30Z

0

well , i don't know why exactly but it solves itself if you label the x axis

import matplotlib.pyplot as plt


plt.plot([1, 2, 3, 4])  #this line makes a simple line plot
plt.xlabel('x - axis')
plt.ylabel('some numbers') #executing thins line makes a new empty plot with the label
plt.show()  #nothing happens

answered Jan 18, 2022 at 16:45

DanielGzgzz

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2 Comments

Berend Over a year ago

I am sorry Daniel, this doesn't work. When I execute the line ,in the plots pane in Spyder, an empty graph is shown with the x-axis label. There is somewhere a setting wrong.

DanielGzgzz Over a year ago

Then maybe just add an X axis as usual? plt.plot(X,Y)

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