import numpy as np
import matplotlib.pyplot as plt
from matplotlib.widgets import Slider
import tkinter as tk

def b1():
  plt.clf()
  plt.pause(0.01)
  ax = fig.add_subplot(111)
  x = np.arange(0, 10, 0.1)
  y = np.sin(x)
  ax.plot(x, y)
  fig.canvas.draw_idle()

def b2():
  plt.clf()
  plt.pause(0.01)
  ax1 = fig.add_subplot(211)
  ax2 = fig.add_subplot(212)
  x = np.arange(0, 20, 0.1)
  y = np.sin(x**2)
  y2 = np.sin(np.sqrt(x))*2
  ax1.plot(x, y)
  ax2.plot(x, y2)
  fig.canvas.draw_idle()

rt = tk.Tk()
btn1 = tk.Button(rt, text='1', command=b1)
btn2 = tk.Button(rt, text='2', command=b2)
btn1.grid(column=0, row=0)
btn2.grid(column=1, row=0)
fig = plt.figure(figsize=(8, 4))
rt.mainloop()