From: "Fraga, Eric" <e.fraga@ucl.ac.uk>
To: Justus Winter <justus@sequoia-pgp.org>
Cc: "emacs-orgmode@gnu.org" <emacs-orgmode@gnu.org>
Subject: Re: Bug: Operator associativity problem [9.1.9 (release_9.1.9-65-g5e4542 @ /usr/share/emacs/26.1/lisp/org/)]
Date: Thu, 26 Sep 2019 05:23:37 +0000 [thread overview]
Message-ID: <87h84zmy08.fsf@ucl.ac.uk> (raw)
In-Reply-To: <874l10nsw5.fsf@thinkbox.jade-hamburg.de> (Justus Winter's message of "Wed, 25 Sep 2019 20:16:26 +0200")
On Wednesday, 25 Sep 2019 at 20:16, Justus Winter wrote:
> However, I cannot fathom the rationale behind this property, and for a
> spreadsheet-like application I consider it borderline negligent.
Not my place to defend (or otherwise) the decisions that went into defining the grammar for Calc. However, there is no single universal precedence definition for algebraic expressions. People do write, e.g. in heat transfer applications, W/m^2 K to mean W/(m^2 K) which is not the precedence you believe should be implemented. Just because Excel, say, implements something does not make it negligent for others to implement something different.
As a mathematician, I always write my expressions as, for instance, W m^{-2} K^{-1} both in practice and when teaching to avoid all doubt.
--
Eric S Fraga via Emacs 27.0.50, Org release_9.2.4-401-gfabd6d
next prev parent reply other threads:[~2019-09-26 5:23 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-25 9:50 Bug: Operator associativity problem [9.1.9 (release_9.1.9-65-g5e4542 @ /usr/share/emacs/26.1/lisp/org/)] Justus Winter
2019-09-25 12:51 ` Fraga, Eric
2019-09-25 18:16 ` Justus Winter
2019-09-26 5:23 ` Fraga, Eric [this message]
2019-09-26 9:23 ` Robert Pluim
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