sfaleron/ln2.py
Created Sep 24, 2015

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Quick ln2 function for Python

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ln2.py

      
        from math import ceil
      
        # for example, inc=4 gives ln16, or the number of hexadecimal digits
      
        # required to represent n.
      
        def ln2(n, inc=1):
      
           if n<0:
      
              raise ValueError('math domain error')
      
           i = 0
      
           n = int(ceil(n))
      
           while n:
      
              i += 1
      
              n >>= inc
      
           return i

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