问题
From here I found this code:
import random
from matplotlib import pyplot as plt
import numpy as np
plt.ion() # interactive mode
ydata = [0] * 50
# make plot
ax1 = plt.axes()
line, = plt.plot(ydata)
plt.ylim([0, 100]) # set the y-range
while True:
randint = int(random.random() * 100)
ymin = float(min(ydata)) - 10
ymax = float(max(ydata)) + 10
plt.ylim([ymin,ymax])
ydata.append(randint)
del ydata[0]
line.set_xdata(np.arange(len(ydata)))
line.set_ydata(ydata) # update data
plt.draw() # update plot
I get a plot window that pops up, but no data appears and nothing gets redrawn...any idea what I'm doing wrong?
回答1:
The issue you are having is due to the way that gui mainloops work. When ever you plot call draw events get added to the queue of events for the main loop to process. If you add them as fast as possible the loop can never clear it's queue and actually draw to the screen.
Adding a plt.pause(.1) will pause the loop and allow the main loop (at the risk of being anthropomorphic) 'catch it's breath' and update the widgets on the screen
Related:
- Python- 1 second plots continous presentation
- matplotlib qt imshow animate
- Figure GUI freezing
- make matplotlib draw() only show new point
来源：https://stackoverflow.com/questions/19105388/python-2-7-mac-osx-interactive-plotting-with-matplotlib-not-working