MatPlotLib的ion()和draw()无法正常工作 [英] MatPlotLib's ion() and draw() not working

问题描述

我正在尝试使用for循环实时绘制图形.我有以下简单代码:

I am trying to plot figures in real time using a for loop. I have the following simple code:

import matplotlib.pyplot as plt

plt.ion()
plt.figure()
for i in range(100):
    plt.plot([i], [i], 'o')
    plt.draw()
    plt.pause(0.0001)

此代码在完成计算之前不会显示该数字，我不希望这样做.我希望它在每个循环之后绘制图形.如果将plt.draw()替换为plt.show，则会实时输出多个图形，但是我希望它们全部出现在同一图形中.有什么想法吗?

This code does not show the figure until it has finished computing, which I don't want. I want it to draw the figure after every loop. If I replace plt.draw() with plt.show, multiple figures are output in real time, but I want them all to appear in the same figure. Any ideas?

我用Anaconda下载了PyCharm，一切正常.我猜这是Spyder的问题，因为我尝试了几种不同的版本而没有成功.如果有人知道是什么原因导致Spyder出现此问题，请告诉我！

I downloaded PyCharm with Anaconda and everything works fine. I guess it's a problem with Spyder since I tried a few different versions of it without success. If anyone has any clue what is causing this problem in Spyder, let me know!

推荐答案

适用于您的案例，来自: Python实时绘图

Adapted for your case from : Python realtime plotting

import matplotlib.pyplot as plt
import numpy as np
import time

fig = plt.figure()
ax = fig.add_subplot(111)

# some X and Y data
x = [0]
y = [0]

li, = ax.plot(x, y,'o')

# draw and show it
fig.canvas.draw()
plt.show(block=False)

# loop to update the data
for i in range(100):
    try:
        x.append(i)
        y.append(i)

        # set the new data
        li.set_xdata(x)
        li.set_ydata(y)

        ax.relim() 
        ax.autoscale_view(True,True,True) 

        fig.canvas.draw()

        time.sleep(0.01)
    except KeyboardInterrupt:
        plt.close('all')
        break

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