code optimization (calc PI) / Full Code of PI calc in Python and C.

Gabriel Genellina gagsl-py at yahoo.com.ar
Thu Jan 4 02:57:50 CET 2007


At Wednesday 3/1/2007 22:10, Michael M. wrote:

>Ok, here is the code. It is a translation of the following code, found
>on the internet.
>
>* The C is very fast, Python not.
>* Target: Do optimization, that Python runs nearly like C.

Why? Python is strong in other aspects, *not* on computation speed.

Anyway, for a nice and rather fast Python implementation (yielding 
unlimited digits *without* unlimited storage), see 
http://mail.python.org/pipermail/python-list/2006-November/414347.html
The code, for reference:

def pi():
      k, a, b, a1, b1 = 2, 4, 1, 12, 4
      while 1:
          # Next approximation
          p, q, k = k*k, 2*k+1, k+1
          a, b, a1, b1 = a1, b1, p*a+q*a1, p*b+q*b1
          # Yield common digits
          d, d1 = a/b, a1/b1
          while d == d1:
              yield str(d)
              a, a1 = 10*(a%b), 10*(a1%b1)
              d, d1 = a/b, a1/b1

import sys
sys.stdout.writelines(pi())

(The converted C code does a lot of nonsense in Python terms - maybe 
you should try to interpret *what* it does and then reimplement that 
using Python)


-- 
Gabriel Genellina
Softlab SRL 


	

	
		
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