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Re: Inconsistent behavior?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg87291] Re: [mg87243] Inconsistent behavior?
  • From: Murray Eisenberg <murray at math.umass.edu>
  • Date: Sun, 6 Apr 2008 06:46:26 -0400 (EDT)
  • Organization: Mathematics & Statistics, Univ. of Mass./Amherst
  • References: <200804050923.EAA12082@smc.vnet.net>
  • Reply-to: murray at math.umass.edu

Yes, I see the same phenomenon of unevaluated expressions starting with 
6 from:

   Clear[n]
   Table[Binomial[n,k],{k,1,10}]

And one sees the same thing in:

   Table[Binomial[n, n - k], {k, 1, 7}]

But I'm not surprised:  Beyond a few special values for k, there may be 
special code inside the kernel for evaluating the binomial coefficients.


angela wrote:
> Binomial[n,4] yields
> 1/24 (-3+n) (-2+n) (-1+n) n
> 
> Binomial[n,5] yields
> 1/120 (-4+n) (-3+n) (-2+n) (-1+n) n
> 
> Binomial[n,6] yields
> Binomial[n,6]
> 
> Binomial[n,7] yields
> Binomial[n,7]
> 
> Is some setting doing this.
> 
> Thanks;
> Angela
> 

-- 
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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