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MathGroup Archive 2007

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Re: Guessing "exact" values

  • To: mathgroup at smc.vnet.net
  • Subject: [mg76171] Re: [mg76079] Guessing "exact" values
  • From: Murray Eisenberg <murray at math.umass.edu>
  • Date: Thu, 17 May 2007 05:59:12 -0400 (EDT)
  • Organization: Mathematics & Statistics, Univ. of Mass./Amherst
  • References: <200705160920.FAA29604@smc.vnet.net>
  • Reply-to: murray at math.umass.edu

As I remember, at IMS'06 (Avignon) Stephen Wolfram (via remote link-up) 
played with a function to do just that.  Did I remember correctly?

If so, I cannot recall the name of the function, so I don't know whether 
the function made it into 6.0.  The closest thing I can find is 
RootApproximant, but that doesn't seem to "recognize" an expression 
involving a transcendental number.

Szabolcs wrote:
> "Another computer algebra system" has a function, identify(), which 
> attempts to guess the exact expression that evaluates to a particular 
> numerical value.
> 
> Example:
> 
> In[1]:= N[3Pi+3/2,10]
> 
> Out[1]= 10.92477796
> 
>  > identify(10.92477796);
>                                    3
>                                    - + 3 Pi
>                                    2
> 
> Is there a package with similar functionality for Mathematica?
> 
> Szabolcs
> 

-- 
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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