text: """
  ==================================
  Modifying the coordinate formatter
  ==================================
  
  Show how to modify the coordinate formatter to report the image "z"
  value of the nearest pixel given x and y
  """
  import numpy as np
  import matplotlib.pyplot as plt
  
  X = 10*np.random.rand(5, 3)
  
  fig, ax = plt.subplots()
  ax.imshow(X, interpolation='nearest')
  
  numrows, numcols = X.shape
  
  
  def format_coord(x, y):
      col = int(x + 0.5)
      row = int(y + 0.5)
      if col >= 0 and col < numcols and row >= 0 and row < numrows:
          z = X[row, col]
          return 'x=%1.4f, y=%1.4f, z=%1.4f' % (x, y, z)
      else:
          return 'x=%1.4f, y=%1.4f' % (x, y)
  
  ax.format_coord = format_coord
  plt.show()
  