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From: Christian Schlauer <cs-muelleimer-rubbish.bin@arcor.de>
To: emacs-devel@gnu.org
Subject: Re: Calc: `*' binds more strongly than `/'
Date: Sun, 22 Apr 2007 12:23:51 +0200	[thread overview]
Message-ID: <f0fd1m$dur$2@sea.gmane.org> (raw)
In-Reply-To: 87ps5zi1h2.fsf@truman.edu

Jay Belanger <belanger@truman.edu> writes:

> Stefan Monnier <monnier@iro.umontreal.ca> writes:
> ...
>> If there are too many existing calc-scripts that would be
>> broken by such a change, fine, but if this only mostly affects interactive
>> use, then changing it would make a lot of sense.
>
> While several people have said the current behavior is convenient for
> interactive use, I would hope (and expect) that there aren't any
> calc-scripts depending on this behavior.  But it'd be nice to know for
> sure. 

You are the maintainer of Calc -- do you have any contact to package
authors or users of packages that make use of Calc? I only know about
Org-mode, see below. What about table.el?

The tables in Org-mode use Calc. That is a non-interactive use of
Calc, isn't it:

| Value | Percentage |
|-------+------------|
|    17 |            |
|    56 |            |
|    42 |            |
#+TBLFM: $2=$1/65*100

The `#+TBLFM:' line is a Calc-script, and some of them would break, if
they rely on the precedence of multiplication, like this example. But
nevertheless I think Calc's behaviour could (and should) be changed,
because:

- Existing tables aren't automatically recalculated when you open the
  file, you have to do `C-u C-c C-c' in the table. So there is no
  `immediate' damage. But even better:

- Org-mode could keep the existing Calc behaviour for existing tables
  but use the `new' more standards-conforming Calc behaviour when the
  script line `#+TBLFM:' starts with `#+TBLFMv2:' or something
  similar, which could be Org-mode's new default as soon as Calc has
  been modified.

So regarding Org-mode, nothing will break, I think.

> Perhaps after the release I could add a customizable variable,
> `calc-multiplication-has-precedence' (default t), and then anyone that
> wants to can set it to nil and try out the different behavior.

Rather make the default nil so that new users can use Calc and Org
like *any* pocket calculator or *any* spreadsheet...

WDYT?

Regards,

Christian

  parent reply	other threads:[~2007-04-22 10:23 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
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 [this message]
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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