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By: a guest on Aug 30th, 2012  |  syntax: None  |  size: 0.83 KB  |  hits: 11  |  expires: Never
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  1. import numpy as np
  2.  
  3.  
  4. n = 4
  5. data = np.reshape(range(4*4),(n,n))
  6. data = data[:,:,np.newaxis]
  7.  
  8. print data[:,:,0],data.shape
  9.  
  10. seq = [0,1,2,3]
  11.  
  12.  
  13. """seq
  14. 0 : up/down
  15. 1 : down/up
  16. 2 : left/right
  17. 3 : right/left
  18. """
  19.  
  20. def fold(data,seq):
  21.  
  22.     if len(seq) == 0:
  23.         print 'last=',data[0,0,:]
  24.         return data
  25.  
  26.     if seq[0]==0:
  27.         n2 = data.shape[0]/2
  28.         dfold = np.dstack((data[n2-1::-1,:],data[n2:,:]))
  29.         fold(dfold,seq[1:])
  30.  
  31.     if seq[0]==1:
  32.         n2 = data.shape[0]/2
  33.         dfold = np.dstack((data[:n2-1:-1,:],data[:n2,:]))
  34.         fold(dfold,seq[1:])
  35.  
  36.     if seq[0]==2:
  37.         n2 = data.shape[1]/2
  38.         dfold = np.dstack((data[:,n2-1::-1],data[:,n2:]))
  39.         fold(dfold,seq[1:])
  40.  
  41.     if seq[0]==3:
  42.         n2 = data.shape[1]/2
  43.         dfold = np.dstack((data[:,:n2-1:-1],data[:,:n2]))
  44.         fold(dfold,seq[1:])
  45.  
  46.  
  47. fold(data,seq)
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