OpenEuphoria

Re: Calculating with imprecise values

• Posted by Matt Lewis <matthewwalkerlewis at gmail.com> Dec 14, 2005
• 676 views

Juergen Luethje wrote:
> 
> Matt Lewis wrote:
> 
> <snip>
> 
> > It sounds like fuzzy numbers and fuzzy arithmetic.  I've thought about
> > writing something to do this, but haven't yet...
> 
> I'm not sure whether I understand the meaning of the expressions "fuzzy
> numbers" and "fuzzy arithmetic" correctly. 
> I do not mean what is called "Fuzzy Logic" (according to Lotfi Zadeh and
> others) -- although I considers that very useful. 
> 
> What I mean ATM is something that I think has got to do with "error
> propagation". Please see my reply to "jxliv7" for details.

I think that Fuzzy numbers and arithmetic could be used for this, 
although it could be overkill.  Here are a couple of so-so links to
get you started:

http://whatis.techtarget.com/definition/0,,sid9_gci283979,00.html

Mathematica documentation on fuzzy arithmetic, which gives some
visuals that might help:
http://documents.wolfram.com/applications/fuzzylogic/Manual/9.html


If you have good tolerance for reading math, this looks like a good 
paper that covers the basics, and has other interesting stuff:

http://www.nist.gov/msidlibrary/doc/pfn-fss.pdf

Matt Lewis