How can I make this piece of code even faster?
Steven D'Aprano
steve+comp.lang.python at pearwood.info
Sun Jul 21 06:31:42 EDT 2013
On Sun, 21 Jul 2013 03:19:24 -0700, pablobarhamalzas wrote:
> Thank's for all the replies! I've tried some of the imporovements you
> suggested (using math.exp() and sum() or math.fsum()). None of that made
> the code faster, because they are functions you are calling lots of
> times, and function calling is quite time expensive (same as x**(1/2) is
> faster than math.sqrt(x)).
You are *badly* mistaken. Not only is sqrt more accurate, but it is also
much faster.
[steve at ando ~]$ python3.3 -m timeit -s "x = 2.357e7" "x**0.5"
1000000 loops, best of 3: 0.319 usec per loop
[steve at ando ~]$ python3.3 -m timeit -s "x = 2.357e7" -s "from math import
sqrt" "sqrt(x)"
10000000 loops, best of 3: 0.172 usec per loop
How exactly are you timing the code?
--
Steven
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