Dan Upton wrote:
On Thu, May 22, 2008 at 2:53 PM, Mensanator <[EMAIL PROTECTED]> wrote:
On May 22, 11:32 am, "Dutton, Sam" <[EMAIL PROTECTED]> wrote:
I've noticed that the value of math.pi -- just entering it at the interactive
prompt -- is returned as 3.1415926535897931, whereas (as every pi-obsessive
knows) the value is 3.1415926535897932... (Note the 2 at the end.)
Is this a precision issue, or from the underlying C, or something else? How is
math.pi calculated?
If you actually need that many digits, use a different library.
import gmpy
print gmpy.pi(64) # 64 bit precision
3.14159265358979323846
print gmpy.pi(128) # 128 bit precision
3.141592653589793238462643383279502884197
print gmpy.pi(16384) # 16384 bit precision
3.14159265358979323846264338327950288419716939937510582097494459
...
Who wants to verify that that's correct to that many digits? ;)
Ramanujan?
http://numbers.computation.free.fr/Constants/Pi/piramanujan.html
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