From: Ken Thompson via TUHS <tuhs@minnie.tuhs.org>
To: SPC <spedraja@gmail.com>
Cc: The Eunuchs Hysterical Society <tuhs@tuhs.org>
Subject: Re: [TUHS] Space Travel, was New: The Earliest UNIX Code
Date: Fri, 18 Oct 2019 15:04:59 -0700 [thread overview]
Message-ID: <CAG=a+rgS8iJKnd85wv5kt8JfgZNkOR0u47FySMXYvD+jsOKEZA@mail.gmail.com> (raw)
In-Reply-To: <CACytpF--GW2+i=T7q396E6JRaij-xbR=pvV8thr_YyxjwLN_Mg@mail.gmail.com>
while writing "space travel,"
i could not get the space ship integration
around a planet to keep from either gaining or
losing energy due to floating point errors.
i asked dick hamming if he could help. after
a couple hours, he came back with a formula.
i tried it and it worked perfectly. it was some
weird simple double integration that self
corrected for fp round off. as near as i can
ascertain, the formula was never published
and no one i have asked (including me) has
been able to recreate it.
i look forward to the OCR of the code.
On Fri, Oct 18, 2019 at 1:20 PM SPC <spedraja@gmail.com> wrote:
>
> Well, It appears that CHM has published an article about "Space Travel" code...
>
> https://computerhistory.org/blog/the-earliest-unix-code-an-anniversary-source-code-release/
>
> Cordiales saludos / Kind Regards.
>
> Gracias | Regards - Saludos | Greetings | Freundliche Grüße | Salutations
> --
> Sergio Pedraja
> --
next prev parent reply other threads:[~2019-10-18 22:05 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-18 11:52 Doug McIlroy
2019-10-18 18:36 ` Steffen Nurpmeso
2019-10-18 20:19 ` SPC
2019-10-18 22:04 ` Ken Thompson via TUHS [this message]
2019-10-18 23:20 ` Arthur Krewat
2019-10-19 0:57 ` G. Branden Robinson
2019-10-19 1:11 ` Arthur Krewat
2019-10-29 2:18 ` Lawrence Stewart
2019-10-26 15:10 ` Lars Brinkhoff
-- strict thread matches above, loose matches on Subject: below --
2019-10-19 14:40 Doug McIlroy
2019-10-19 18:32 ` Abhinav Rajagopalan
2019-10-19 18:44 ` Abhinav Rajagopalan
2019-10-19 19:19 ` Clem Cole
2019-10-19 19:50 ` Henry Bent
2019-10-19 20:24 ` Arthur Krewat
2019-10-19 13:13 Doug McIlroy
2019-10-17 19:21 [TUHS] New: The Earliest UNIX Code - From the Collection of the Software History Center, Computer History Museum Lyle Bickley
2019-10-17 20:44 ` [TUHS] Space Travel, was New: The Earliest UNIX Code Warren Toomey
2019-10-17 22:39 ` Warner Losh
2019-10-17 22:51 ` Warren Toomey
2019-10-18 5:59 ` Lars Brinkhoff
2019-10-18 9:30 ` SPC
2019-10-18 17:36 ` Nemo
2019-10-18 3:01 ` Warren Toomey
2019-10-18 5:07 ` Lars Brinkhoff
2019-10-18 5:10 ` Lars Brinkhoff
2019-10-18 13:37 ` Warner Losh
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