[sac-user] print function alternatives?
bernecky at snakeisland.com
Mon Aug 2 20:26:32 CEST 2010
Is this better?
rbe at obelix:~> cat crud.sac
x = 0.07;
Raphael 'kena' Poss wrote:
> Hi all,
> Op 2 aug 2010, om 18:45 heeft Robert Bernecky het volgende geschreven:
>> In particular, it still uses printf() [...]
>> My intent was to make it use a precise formatter, such
>> as that proposed in "Printing Floating-Point Numbers Quickly and Accurately", by Robert G. Burger and R. Kent Dybvig.
> For your information, many open-source Unices nowadays use the gdtoa library by D. Gay from netlib: http://www.netlib.org/fp/gdtoa.tgz
> This uses concepts and algorithms from
> T. J. Dekker, "A Floating-Point Technique for Extending the
> Available Precision", Numer. Math. 18 (1971), pp. 224-242
> "How to Print Floating-Point Numbers Accurately" by
> Guy L. Steele, Jr. and Jon L. White [Proc. ACM SIGPLAN '90, pp. 112-126].
> As far as precision goes, this is formally specified. I don't know how it compares to the techniques in Burger & Dybvig, actually.
> As an option, is it possible to output floats in hexadecimal? This should prevent rounding errors.
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