Best search algorithm to find condition within a range

Steven D'Aprano steve+comp.lang.python at pearwood.info
Wed Apr 8 02:38:45 CEST 2015


On Wed, 8 Apr 2015 03:44 am, Ian Kelly wrote:

>>>>
to_base(2932903594368438384328325832983294832483258958495845849584958458435439543858588435856958650865490,
>>>> 429496729)
> [27626525, 286159541, 134919277, 305018215, 329341598, 48181777,
> 79384857, 112868646, 221068759, 70871527, 416507001, 31]


They're not exactly *digits* though, are they? Without an easy to use set of
429496729 different symbols, the whole exercise is rather pointless. It's
not more compact: 97 decimal digits, versus 121 characters in the list
representation. 110 if you strip out the spaces between items. It's
certainly not more memory efficient: the long int 293...490 takes 56 bytes,
compared to 80 bytes for just the list, not including the memory used by
its 12 int items. (Results may vary in other versions of Python.) You can't
do arithmetic on it faster than Python's built-ins.

Besides, it isn't clear to me whether Jonas wants to convert decimal
293...490 *into* base 429496729 as you have done, or *base 429496729*
293...490 into decimal.



-- 
Steven




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