Embed a pyplot in a tkinter window and update it

Question

I am trying to write a program that has a pyplot (as in matplotlib.pyplot) within a Tkinter GUI which can be updated. Basically what I want is a program with a Tkinter inter

Answer 1

I figured it out, I need to call the draw() method on the figure's canvas attribute in order to get it to redraw, the corrected code is below. Also anyone who is encountering this or similar problems should probably look at matplotlib.animate if they need to be dynamically updating their pyplot

import numpy as np
import Tkinter as tk

import matplotlib
matplotlib.use('TkAgg')

from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg
import matplotlib.pyplot as plt

root = tk.Tk()

fig = plt.figure(1)
plt.ion()
t = np.arange(0.0,3.0,0.01)
s = np.sin(np.pi*t)
plt.plot(t,s)

canvas = FigureCanvasTkAgg(fig, master=root)
plot_widget = canvas.get_tk_widget()

def update():
    s = np.cos(np.pi*t)
    plt.plot(t,s)
    #d[0].set_ydata(s)
    fig.canvas.draw()

plot_widget.grid(row=0, column=0)
tk.Button(root,text="Update",command=update).grid(row=1, column=0)
root.mainloop()