From: Stefan Monnier <monnier@iro.umontreal.ca>
To: herring@lanl.gov
Cc: emacs-devel@gnu.org, "Kim F. Storm" <storm@cua.dk>,
"Randal L. Schwartz" <merlyn@stonehenge.com>
Subject: Re: Calc: `*' binds more strongly than `/'
Date: Thu, 19 Apr 2007 12:10:11 -0400 [thread overview]
Message-ID: <jwv8xcowdqj.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <55350.128.165.123.18.1176926533.squirrel@webmail.lanl.gov> (Davis Herring's message of "Wed\, 18 Apr 2007 13\:02\:13 -0700 \(PDT\)")
>> I don't think so.
>>
>> Theorem: the "/" is *not* a horizontal bar.
>> Proof:
>>
>> What parse tree do you expect from A+B/C+D?
>>
>> Is it the same as the one you expect from
>>
>> A + B
>> -----
>> C + D
>>
>> QED.
> The "/" there can certainly be considered a horizontal bar: under the B,
> and over the C.
> B
> A + --- + D
> C
Then we're back to precedence and the question becomes why don't you
consider A*B/C*D as
B
A * --- * D
C
In any case, I still haven't heard any concrete reason why the non-standard
behavior of calc is preferred to the more common behavior. Neither is
perfect because there is no such thing, but one of them is sufficiently
surprising to deserve big warnings in the Calc doc and the Org doc, whereas
the other would be "business as usual".
Stefan
next prev parent reply other threads:[~2007-04-19 16:10 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-04-14 11:57 Calc: `*' binds more strongly than `/' Christian Schlauer
2007-04-14 15:09 ` Jay Belanger
2007-04-15 19:21 ` Chong Yidong
2007-04-15 20:05 ` Stefan Monnier
2007-04-17 12:47 ` Randal L. Schwartz
2007-04-17 18:03 ` Stefan Monnier
2007-04-18 8:44 ` Kim F. Storm
2007-04-18 19:27 ` Stefan Monnier
2007-04-18 20:02 ` Davis Herring
2007-04-18 20:16 ` David Kastrup
2007-04-18 21:43 ` Davis Herring
2007-04-19 16:10 ` Stefan Monnier [this message]
2007-04-20 11:13 ` Randal L. Schwartz
2007-04-20 13:40 ` Stefan Monnier
2007-04-20 14:07 ` Jay Belanger
2007-04-22 1:31 ` Miles Bader
2007-04-22 10:19 ` Christian Schlauer
2007-04-22 10:23 ` Christian Schlauer
2007-04-22 19:47 ` Jay Belanger
2007-04-23 10:46 ` Jason Rumney
2007-04-23 13:03 ` Kim F. Storm
2007-04-23 15:54 ` Jay Belanger
2007-04-25 19:56 ` Christian Schlauer
2007-04-25 20:54 ` Jay Belanger
2007-04-26 3:35 ` Stefan Monnier
2007-04-26 4:06 ` Jay Belanger
2007-04-26 14:11 ` Stefan Monnier
2007-04-26 21:07 ` Christian Schlauer
2007-04-26 15:07 ` Davis Herring
2007-04-26 16:01 ` Stefan Monnier
2007-04-26 18:32 ` Luc Teirlinck
2007-04-26 21:29 ` Christian Schlauer
2007-04-26 23:17 ` Luc Teirlinck
2007-04-26 21:07 ` Christian Schlauer
2007-04-27 1:27 ` Jay Belanger
2007-04-26 17:47 ` Davis Herring
2007-06-20 15:23 ` Jay Belanger
2007-06-20 16:02 ` Kim F. Storm
2007-06-20 17:13 ` Jay Belanger
2007-06-20 17:29 ` Luc Teirlinck
2007-06-20 17:54 ` Jay Belanger
2007-06-20 19:14 ` Kim F. Storm
2007-06-20 19:28 ` Luc Teirlinck
2007-06-20 20:18 ` Jay Belanger
2007-04-17 18:54 ` Jay Belanger
2007-04-18 21:55 ` Christian Schlauer
2007-04-19 2:58 ` Daniel Brockman
2007-04-22 10:27 ` Christian Schlauer
2007-04-26 16:00 ` Daniel Brockman
2007-04-19 15:16 ` Drew Adams
2007-04-19 17:05 ` David Kastrup
2007-04-19 17:18 ` Drew Adams
2007-04-19 17:33 ` David Kastrup
2007-04-16 15:38 ` Richard Stallman
2007-04-17 12:47 ` Randal L. Schwartz
2007-04-18 21:29 ` Christian Schlauer
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