The pyplot does not save the figure

Question

I have the code that uses pyplot function but the plot that is saved shows an empty area. Removing variables did not give result. What is wrong??

import numpy as np
import matplotlib.pyplot as plt
 
print('Квадратическая функция y=ax^2+bx+c.')
a = 1 
b = 1 
c = 1 
 
x = np.linspace(-100, 100, 1000)
y = a*x**2 + b*x + c  
 
fig, ax = plt.subplots()
ax.plot(x, y)
plt.show()
plt.savefig('mygraph.png')
print('the graph was saved')

put the `plt.savefig` command before `plt.show` – tmdavison May 03 '22 at 16:37 — tmdavison, May 03 '22 at 16:37

score 0 · Accepted Answer · answered May 03 '22 at 16:40

0

plt.show() should come after plt.savefig()

Explanation: plt.show() clears the whole thing, so anything afterwards will happen on a new empty figure

so try:

plt.savefig('mygraph.png')
plt.show()

answered May 03 '22 at 16:40

CodePsy-2001

38
6

https://stackoverflow.com/questions/9012487/matplotlib-pyplot-savefig-outputs-blank-image – CodePsy-2001 May 03 '22 at 16:40

score 0 · Answer 2 · answered May 03 '22 at 17:00

The putting plt.savefig('mygraph.png') before plt.show() works.

import numpy as np
import matplotlib.pyplot as plt
 
print('Квадратическая функция y=ax^2+bx+c.')
a = 1 
b = 1 
c = 1 
 
x = np.linspace(-100, 100, 1000)
y = a*x**2 + b*x + c  
 
fig, ax = plt.subplots()
ax.plot(x, y)
plt.savefig('mygraph.png')
plt.show()
print('the graph was saved')

The pyplot does not save the figure

2 Answers2