使用ipywidgets的交互式matplotlib

问题描述

我想在IPython（python3）中使用 Matplotlib 和 ipywidgets 实现交互式情节。那么，我如何才能有效地做到这一点（顺利改变而没有延迟）？

I want to implement an interactive plot using Matplotlib and ipywidgets in IPython (python3). So, how I can do this efficiently (change smoothly without delay)?

另一个问题是为什么这段代码有效？！

And another question is why this code works?!

from ipywidgets import *
import numpy as np
import matplotlib.pyplot as plt
%matplotlib inline

x = np.linspace(0, 2 * np.pi)

def update(w = 1.0):
    fig = plt.figure()
    ax = fig.add_subplot(1, 1, 1)
    ax.plot(x, np.sin(w * x))

    fig.canvas.draw()

interact(update);

但是，这不起作用？！

from ipywidgets import *
import numpy as np
import matplotlib.pyplot as plt
%matplotlib inline

x = np.linspace(0, 2 * np.pi)
fig = plt.figure()
ax = fig.add_subplot(1, 1, 1)
line, = ax.plot(x, np.sin(x))

def update(w = 1.0):
    line.set_ydata(np.sin(w * x))
    fig.canvas.draw()

interact(update);

推荐答案

第二种方法是适用于笔记本后端的方法

The second approach is the right one for the notebook backend

%matplotlib notebook

或者使用ipympl。

Or with ipympl.

但是，它不适用于不更新绘图的内联后端。

However, it won't work with the inline backend which does not update the plot.

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