我试图使用matplotlib更新Tkinter画布中的双面板图。这里是显示我当前理解的最小代码。主要问题是导航工具栏在初始图中工作时（y = sin（x），y = cos（x）），但是当我按下更新按钮来更新它时，它失败了。例如，如果我放大一条曲线，我不能使用home键返回到原来的状态。我一直在尝试不同的方法，但无济于事。我会感谢任何人的建议。我注意到的一个小问题是，如果我想杀死情节，我应该去菜单栏，选择python/退出Python，否则，如果我只是点击绘图窗口左上角的X，终端就会冻结（我必须杀死终端）。
Python 2.7.14和matplotlob 2.1.0

from Tkinter import *
import Tkinter as tk
import ttk
from math import exp
import os  # for loading files or exporting files
import tkFileDialog
##loading matplotlib modules
import matplotlib
matplotlib.use("TkAgg")
import matplotlib.pyplot as plt
from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg, NavigationToolbar2TkAgg
from matplotlib.figure import Figure
import matplotlib.gridspec as gridspec
import numpy as np

top = tk.Tk()
top.title("Intermolecular PDFs")

top_frame = ttk.Frame(top, padding = (10, 10))
top_frame.pack()
fig = plt.figure(figsize=(10, 6), dpi=100) ##create a figure; modify the size here

x = np.linspace(0,1)
y = np.sin(x)
z = np.cos(x)

fig.add_subplot(211)

plt.title("Individual PDFs")
plt.xlabel(ur"r (\u00c5)", labelpad = 3, fontsize = 15)
plt.ylabel(ur"PDF, G (\u00c5$^{-2})$", labelpad = 10, fontsize = 15)
plt.plot(x,y, "r-", lw=2)
plt.xticks(fontsize = 11)
plt.yticks(fontsize = 11)

fig.add_subplot(212)

plt.title("Difference PDFs")
plt.xlabel(ur"r (\u00c5)", labelpad = 3, fontsize = 15)
plt.ylabel(ur"PDF, G (\u00c5$^{-2})$", labelpad = 10, fontsize = 15)
plt.plot(x,z,"g-", lw=2)
plt.xticks(fontsize = 11)
plt.yticks(fontsize = 11)

fig.tight_layout()

canvas = FigureCanvasTkAgg(fig, master = top_frame)
canvas.show()
canvas.get_tk_widget().pack(side=tk.TOP, fill=tk.BOTH, expand=1)
#self.canvas.draw()

toolbar = NavigationToolbar2TkAgg(canvas, top_frame)
#self.toolbar.pack()
toolbar.update()
canvas._tkcanvas.pack(side=tk.TOP, fill=tk.BOTH, expand=1)

def update():
    fig.clf()

    new_x = np.linspace(1,100)
    new_y = new_x**2
    new_z = new_x**3
    fig.add_subplot(211)

    plt.title("Individual PDFs")
    plt.xlabel(ur"r (\u00c5)", labelpad = 3, fontsize = 15)
    plt.ylabel(ur"PDF, G (\u00c5$^{-2})$", labelpad = 10, fontsize = 15)
    plt.plot(new_x,new_y, "r-", lw=2)
    plt.xticks(fontsize = 11)
    plt.yticks(fontsize = 11)

    fig.add_subplot(212)

    plt.title("Difference PDFs")
    plt.xlabel(ur"r (\u00c5)", labelpad = 3, fontsize = 15)
    plt.ylabel(ur"PDF, G (\u00c5$^{-2})$", labelpad = 10, fontsize = 15)
    plt.plot(new_x,new_z,"g-", lw=2)
    plt.xticks(fontsize = 11)
    plt.yticks(fontsize = 11)

    fig.tight_layout()
    canvas.show()

ttk.Button(top_frame, text = "update",command = update).pack()

top.mainloop()

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