Python matplotlib draws curve outside axis by default?

Question

Does Python matplotlib by default plot outside the axis if matplotlib.pyplot.xlim is applied?

This is the code I have written.

import matplotlib.pyplot as plt
import numpy as np

plt.figure()
x = np.linspace(-10, 10, 11)
y = x**2
plt.plot(x, y)
plt.xlim((-5, 5))

This is what I get: enter image description here

This is what I want:
enter image description here

I am using matplotlib version 3.5.3 with Spyder IDE.

Asked By: inception

||

Source

Answer 1

I solved it by updating all libs in anaconda by :

conda update --all

and disabling inline graphics generation in Spyder.

enter image description here

Answered By: inception

Answer 2

It seems like ‘clip_on’ is setted to ‘False’.

Try to set it to ‘True’ when you plot:

plt.plot(x, y, clip_on = True)

Another option is to clip your x and y before plotting:

import matplotlib.pyplot as plt
import numpy as np
plt.figure()
x = np.linspace(-10, 10, 11)
y = x**2
mask = np.logical_and(np.less_equal(x,5), np.greater_equal(x,-5))
new_x = x[mask]
new_y = y[mask]
plt.plot(new_x, new_y, clip_on=False) #clip_on=False just for demonstration
plt.xlim((-5, 5))

Thats way, eventhough ‘clip_on’ is setted to ‘False’, there won’t be data outside your grid.

matplotlib documentation for ‘clip_on’.

Answered By: Avimsh

Answer 3

I updated Spyder from 5.1.5 to 5.3.3 by

conda uninstall spyder
conda install spyder=5.3.3

Now Spyder does not plot across the axes anymore.

edit:
I was wrong! The problem still occurs. I could find out that the Spyder IPython console format option causes the error. By default "PNG" is set. I typically use "SVG". That is why I first thought the update fixed the issue.

When I choose "SVG" lines still are drawn outside the axis. I executed

plt.plot([1,2,3,4,5,6,7]), plt.xlim((2, 3))

However, when I choose "PNG" everything works fine.

I will ignore this bug, because when I choose "SVG", execute

plt.savefig("myfig.pdf")

and then open the file, all lines are within the box.

Answered By: inception

Python matplotlib draws curve outside axis by default?

Question:

Answers: