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Re: external floating-point representations

From: Bruno Haible
Subject: Re: external floating-point representations
Date: Sun, 23 Apr 2017 03:09:22 +0200
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Hi Paul,

> Perhaps this is because I am a fan of shorter, more-intuitive numbers. You can
> blame me for the fact that in Emacs the double-precision floating-point number
> closest to 0.1 displays as "0.1" rather than as the more-precise but uglier
> "0.10000000000000001".

Likewise, in Lisp culture, this kind of shorter external representation of
floating-point is used:
- In Common Lisp, it is specified by the standard [1]. The goal to use as few
  digits as possible is implicit.
- Likewise, in Scheme, it is specified by the standard [2].
- Some schemers even thought it was worthwhile to write a paper about their
  implementation of this specification. [3].


[1] https://www.cs.cmu.edu/Groups/AI/util/html/cltl/clm/node187.html
    "reading a printed representation produces an object that is ... equal to
     the originally printed object."
    "... is expressed using the minimum number of digits ..."
[3] http://www.cs.indiana.edu/~dyb/pubs/FP-Printing-PLDI96-abstract.html

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