> > You argued against applying the Scheme rules because that would make > > marshalling less accurate when the unmarshalling is done on a machine > > with longer floats. > I said the 754 committee had that objection. OK, but either that objection is relevant for Python or it isn't. > This was discussed on David Hough's numeric-interest mailing list at the > time Clinger and Steele/White published their float<->string papers, and > "phooey" was the consensus of the 754 folks on the mailing list at the > time. Interesting -- I didn't know that. But it would make sense -- they're probably more interested in cross-platform computational accuracy than they are in convenience for casual uses. > I personally don't think decimal strings are a sane way to transport > binary floats regardless of rounding gimmicks. Fair enough. > > But on such a machine, 17 digits won't be good enough anyway. > Doesn't change that 17 digits gets closer then shortest-possible: the art > of binary fp is about reducing error, not generally about eliminating > error. > Shortest-possible does go against the spirit of 754 in that respect. That's a fair criticism. On the other hand, maybe ?!ng is right about the desirable properties of display for people being different from those for marshalling/unmarshalling. > > That's what I meant. Rather than 0.47 from exact, I meant 0.47 from > > the best possible. > Well, you originally said that in response to my saying that the standard > doesn't require perfect rounding (and it doesn't), and that the standard > has different accuracy requirements for different inputs (and it does). > So now I'm left wondering what your original "I thought that ..." was > trying to get across. I don't remember; sorry. > > Hey, I know some people who write C programs that don't rely on the > > platform C libraries for anything :-) > Python would love to grab their I/O implementation then <0.8 wink>. http://www.research.att.com/sw/tools/sfio/ I think the licensing terms are compatible with Python, if you're serious.
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