title: How do I refresh a matplotlib plot in a Tkinter window?
body: <p>I was wondering if anyone had an idea as to why the code below does not display a graph with a line in it after the button on the GUI is pressed.  I would like to create a program that executes a long list of commands after a set of data is imported by clicking a button.  One of these commands would be to display the spectral data on a graph within the same window.  Here is what I have so far:</p>
  
  <pre><code># import modules that I'm using
  import matplotlib
  matplotlib.use('TKAgg')
  from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg, NavigationToolbar2TkAgg
  from matplotlib.figure import Figure
  import matplotlib.pyplot as pltlib
  import Tkinter
  from Tkinter import *
  import numpy as np
  import scipy as sc
  #import matplotlib.pyplot as pltlib
  # lmfit is imported becuase parameters are allowed to depend on each other along with bounds, etc.
  from lmfit import minimize, Parameters, Minimizer
  
  
  
  #Make object for application
  class App_Window(Tkinter.Tk):
      def __init__(self,parent):
          Tkinter.Tk.__init__(self,parent)
          self.parent = parent
          self.initialize()
      def initialize(self):
          button = Tkinter.Button(self,text="Open File",command=self.OnButtonClick).pack(side=Tkinter.TOP)
          self.canvasFig=pltlib.figure(1)
          Fig = matplotlib.figure.Figure(figsize=(5,4),dpi=100)
          FigSubPlot = Fig.add_subplot(111)
          x=[]
          y=[]
          self.line1, = FigSubPlot.plot(x,y,'r-')
          self.canvas = matplotlib.backends.backend_tkagg.FigureCanvasTkAgg(Fig, master=self)
          self.canvas.show()
          self.canvas.get_tk_widget().pack(side=Tkinter.TOP, fill=Tkinter.BOTH, expand=1)
          self.canvas._tkcanvas.pack(side=Tkinter.TOP, fill=Tkinter.BOTH, expand=1)
          self.resizable(True,False)
          self.update()
      def refreshFigure(self,x,y):
          self.line1.set_xdata(x)
          self.line1.set_ydata(y)
          self.canvas.draw()
      def OnButtonClick(self):
          # file is opened here and some data is taken
          # I've just set some arrays here so it will compile alone
          x=[]
          y=[]
          for num in range(0,1000):x.append(num*.001+1)
          # just some random function is given here, the real data is a UV-Vis spectrum
          for num2 in range(0,1000):y.append(sc.math.sin(num2*.06)+sc.math.e**(num2*.001))
          X = np.array(x)
          Y = np.array(y)
          self.refreshFigure(X,Y)
  
  if __name__ == "__main__":
      MainWindow = App_Window(None)
      MainWindow.mainloop()
  </code></pre>