It helps in deleting lines in a subplot

faq_subplot-del-lines

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--- howto_faq_sub.rst	2010-12-18 13:12:37.000000000 +0530
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*** 97,102 ****
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      pp.close()
  
  
+ .. _howto-subplots-delete
+ 
+ Delete lines from subplots
+ -------------------------------
+ 
+ If you have have multiple-lines in subplots and would like to add or delete lines in various subplots, a good approach is to save the subplots into the objects. Later access them using the objects into which they have been copied into::
+ 
+     import numpy as np
+     import matplotlib.pyplot as plt
+ 
+     fig = plt.figure()
+     sub1 = fig.add_subplot(211)    # passing subplot(211) into sub1
+     x = np.linspace(0, 50, 500)
+     sub1.plot(x, np.cos(x*x), 'b-')    # plotting on current subplot
+     sub1.set_xlabel(r'$x$')
+     sub1.set_ylabel(r'$y$')
+     sub2 = fig.add_subplot(212)    # passing subplot(212) into sub2
+     sub2.plot(x, np.sin(3*x), 'r-')    # plotting on subplot(212)
+     sub2.plot(x, np.sin(x)*np.cos(4*x), 'k-')
+     sub2.set_ylabel(r'$y$')
+ 
+     # now to add a line in subplot(211)
+     sub1.plot(x,np.cos(x), 'g-' )
+     plt.show()
+ 
+     # delete a line from subplot(212)
+     del sub2.lines[1]
+     plt.draw()
+     
  .. _howto-subplots-adjust:
  
  Move the edge of an axes to make room for tick labels