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argmax.py

a guest Jun 15th, 2011 584 Never
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  1. import time
  2. import random
  3.  
  4. def maxarg(arr):
  5.     counter = 0
  6.     arg = 0
  7.     m = arr[0]
  8.     for x in arr:
  9.         if x > m:
  10.             m = x
  11.             arg = counter
  12.         counter += 1
  13.     return arg
  14.  
  15. if __name__=="__main__":
  16.   arrays=[[i for i in range(1000000)] for j in range(10)]
  17.   for x in arrays: random.shuffle(x)
  18.   before = time.time()
  19.   for array in arrays: print ("    ignore this :" , array.index(max(array)))
  20.   after = time.time()
  21.   print( after-before)
  22.   before = time.time()
  23.   for array in arrays: print ("    ignore this :" , maxarg(array))
  24.   after = time.time()
  25.   print( after-before)
  26.   before = time.time()
  27.   for array in arrays: print ("    ignore this :" , max(zip(array, range(len(array))))[1])
  28.   after = time.time()
  29.   print( after-before)
  30.   before = time.time()
  31.   for array in arrays: print("    ignore this :" ,  max([array[i],i] for i in range(len(array)))[1])
  32.   after = time.time()
  33.   print (after-before)
  34.   before = time.time()
  35.   for array in arrays: print("    ignore this :" ,  max((array[i],i) for i in range(len(array)))[1])
  36.   after = time.time()
  37.   print (after-before)
  38.   before = time.time()
  39.   for array in arrays:  print("    ignore this :" , max(range(len(array)), key=array.__getitem__))
  40.   after = time.time()
  41.   print (after-before)
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