From: sauer at technologists.com (Charles H Sauer)
Subject: [COFF] Fwd: Old and Tradition was [TUHS] V9 shell
Date: Wed, 12 Feb 2020 16:45:54 -0600 [thread overview]
Message-ID: <9f1f6e0a-13ee-0846-e290-ec9871a3f542@technologists.com> (raw)
In-Reply-To: <CANCZdfoxPy3LQvQ-_bAcj1wPKhHbrTvs9qAsXtpTdVHSTCZZDw@mail.gmail.com>
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On 2/12/2020 4:11 PM, Warner Losh wrote:
>
>
> On Wed, Feb 12, 2020, 11:13 AM Clem Cole <clemc at ccc.com
> <mailto:clemc at ccc.com>> wrote:
>
>
>
> On Tue, Feb 11, 2020 at 10:01 PM Larry McVoy <lm at mcvoy.com
> <mailto:lm at mcvoy.com>> wrote:
>
> What little Fortran background I have suggests that the difference
> might be mind set. Fortran programmers are formally trained (at
> least I
> was, there was a whole semester devoted to this) in accumulated
> errors.
> You did a deep dive into how to code stuff so that the error was
> reduced
> each time instead of increased. It has a lot to do with how
> floating
> point works, it's not exact like integers are.
>
> Just a thought, but it might also be the training. My Dad (a
> mathematician and 'computer') passed a few years ago, I'd love to
> have asked him. But I suspect when he and his peeps were doing
> this with a slide rule or at best an Friden mechanical adding
> machine, they were acutely aware of how errors accumulated or not.
> When they started to convert their processes/techniques to Fortran
> in the early 1960s, I agree with you that I think they were
> conscious of what they were doing. I'm not sure modern CS types
> are taught the same things as what might be taught in a course being
> run by a pure scientist who cares in the same way folks like our
> mothers and fathers did in the 1950s and 60s.
>
>
> Most cs types barely know that 2.234 might not be an exact number when
> converted to binary... A few, however can do sophisticated analysis on
> the average ULP for complex functions over the expected range..
If that is true of some today, that is sad and disappointing. I think I
was taught otherwise in my beginning C.S. course at UT-Austin in 1971.
If I recall correctly:
- all doctoral candidates ended up taking two semesters of numerical
analysis. I still have two volume n.a. text in the attic (orange, but
not "burnt orange", IIRC).
- numerical analysis was covered on the doctoral qualifying exam.
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next prev parent reply other threads:[~2020-02-12 22:45 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-11 18:41 [COFF] " clemc
[not found] ` <CAP2nic2C4-m_Epcx7rbW2ssbS850ZFiLKiL+hg1Wxbcwoaa1vQ@mail.gmail.com>
2020-02-12 0:57 ` [COFF] Fwd: " athornton
2020-02-12 1:58 ` clemc
2020-02-12 3:01 ` lm
2020-02-12 18:12 ` clemc
2020-02-12 21:55 ` cym224
2020-02-12 22:11 ` imp
2020-02-12 22:45 ` sauer [this message]
2020-02-12 23:05 ` lm
2020-02-12 23:54 ` [COFF] floating point (Re: " bakul
2020-02-12 23:56 ` bakul
2020-02-13 1:21 ` toby
2020-02-13 6:57 ` [COFF] Fwd: " peter
2020-02-16 21:47 ` wobblygong
2020-02-16 22:10 ` clemc
2020-02-16 22:45 ` krewat
2020-02-16 23:50 ` bakul
2020-02-18 0:17 ` dave
2020-02-18 12:48 ` jpl.jpl
2020-02-24 9:40 ` ik
2020-02-24 15:19 ` lm
[not found] ` <CAP2nic0fK+=eh=5MuY4BJH6zx4tCRMWcazmm1khYMzNmEdf8ug@mail.gmail.com>
2020-02-24 16:15 ` [COFF] [TUHS] Fwd: Old and Tradition was " clemc
2020-02-24 16:19 ` clemc
2020-02-24 16:27 ` [COFF] Fwd: Old and Tradition was [TUHS] " clemc
2020-02-12 16:28 jnc
2020-02-12 18:13 ` clemc
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