Services & Resources / Wolfram Forums
-----
 /
MathGroup Archive
2005
*January
*February
*March
*April
*May
*June
*July
*August
*September
*October
*November
*December
*Archive Index
*Ask about this page
*Print this page
*Give us feedback
*Sign up for the Wolfram Insider

MathGroup Archive 2005

[Date Index] [Thread Index] [Author Index]

Search the Archive

Re: Documentation

  • To: mathgroup at smc.vnet.net
  • Subject: [mg58273] Re: Documentation
  • From: Daniel Lichtblau <danl at wolfram.com>
  • Date: Sat, 25 Jun 2005 01:56:33 -0400 (EDT)
  • References: <200506240649.CAA29400@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Andrzej Kozlowski wrote:
> I guess I have been rather slow but I am gradually coming round to  
> the view that Mathematica's documentation leaves something to be  
> desired. For example:
> 
> 
> ?CoefficientDomain
> 
> CoefficientDomain is an option for GroebnerBasis and  
> PolynomialReduce. Valid
> choices are Integers, Rationals, RationalFunctions, or Polynomials[var].
> 
> However:
> 
> ?InexactNumbers
> 
> InexactNumbers is a setting for the CoefficientDomain option of  
> GroebnerBasis
> and PolynomialReduce.
> 
> 
> InexactNumbers are mentioned in the main documentation:
> 
>   Possible settings for CoefficientDomain are InexactNumbers,  
> Rationals, RationalFunctions and Polynomials[x].
> 
> but this is still quite hopeless as documentation as there is nothing  
> to tell the user that the proper usage is:
> 
> GroebnerBasis[polys, vars, CoefficientDomain -> InexactNumbers[n]]
> 
> where n is precision.

Actually CoefficientDomain->InexactNumbers should work, using a default 
of 100 digits (I think). The fact that InexactNumbers[n] is undocumented 
is an artifact of development history. GroebnerBasis with inexact 
numbers was developed for version 3, and the use of specified precision 
came in version 4 as part of NSolve overhaul.

I'll forward this to the documentation folks to see if it can be updated.


> No wonder that I am yet to meet a person that has heard of numerical  
> Groebner basis in Mathematica never mind anyone actually using it.

Presumably you mean "non-WRI employees". It gets used here a bit.


> Andrzej Kozlowski
> 
> Chiba, Japan
> 
> 


  • References:
  • Prev by Date: Spline
  • Next by Date: Re: Asking questions
  • Previous by thread: Documentation
  • Next by thread: Re: Documentation