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    Welcome!

    This is the community forum for my apps Pythonista and Editorial.

    For individual support questions, you can also send an email. If you have a very short question or just want to say hello — I'm @olemoritz on Twitter.


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    Posts made by Jeff_Burch

    • How to update an existing plot in Pythonista?

      Matplotlib animation. I understand that Pythonista doesn't support the matplotlib animation APIs. Are there any work-arounds?

      I have an IOT application where measurement data is multicast from the IOT device and received by my iPAD for graphing. I wish to build a simple "strip chart" plot that updates each time new data is received.

      I can create a new plot with plt.show( ) each time but my console eventually is overloaded with a series of plot figures. How can I update an existing plot and have it rendered right away?

      Unfortunately the fig.canvas.flush_events( ) API is not implemented in Pythonista. That's what I use on my desktop.

      Here's a simple example that works great on the desktop. What modifications are needed to get this to work in Pythonista? The fig.canvas.flush_events() is a problem on Pythonista.

      import numpy as np
      import time
      import matplotlib.pyplot as plt
      
      plt.ion()
      fig = plt.figure()
      tstart = time.time()               # for profiling
      x = np.arange(0,2*np.pi,0.01)      # x-array
      line, = plt.plot(x,np.sin(x))
      for i in np.arange(1,200):
          line.set_ydata(np.sin(x+i/10.0))  # update the data
          plt.draw()
          fig.canvas.flush_events()
          plt.pause(0.001)  #redraw figure, allow GUI to handle events
      
      print ('FPS:' , 200/(time.time()-tstart))
      plt.ioff()
      plt.show() ```
      posted in Pythonista
      Jeff_Burch
      Jeff_Burch