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Re: Timing of N[ Factorial[4000000], 18]

  • To: mathgroup at smc.vnet.net
  • Subject: [mg95686] Re: [mg95659] Timing of N[ Factorial[4000000], 18]
  • From: Murray Eisenberg <murray at math.umass.edu>
  • Date: Sun, 25 Jan 2009 06:49:00 -0500 (EST)
  • Organization: Mathematics & Statistics, Univ. of Mass./Amherst
  • References: <200901241118.GAA04803@smc.vnet.net>
  • Reply-to: murray at math.umass.edu

   $Version
7.0 for Microsoft Windows (32-bit) (November 10, 2008)

   Timing[N[Factorial[4000000],18]]
{6.047,5.46787756151445098*10^24671065}

Ted Ersek wrote:
> How long does it take Mathematica 7 to compute
>    N[ Factorial[4000000], 18]
> 
> With the old version of Mathematica I have it takes a very long time, 
> and I was wondering if Mathematica 7 is much better.  You might ask why 
> I wanted to do that.  Well I wanted to see how quickly Stirling's 
> formula approaches  Factorial[n]  for large n.
> 
> ------------------------
> Thanks,
>      Ted Ersek
> 
> 

-- 
Murray Eisenberg                     murray at math.umass.edu
Mathematics & Statistics Dept.
Lederle Graduate Research Tower      phone 413 549-1020 (H)
University of Massachusetts                413 545-2859 (W)
710 North Pleasant Street            fax   413 545-1801
Amherst, MA 01003-9305


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