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From: Eric Abrahamsen <eric@ericabrahamsen.net>
To: emacs-orgmode@gnu.org
Subject: Re: getting calc-units working in table formulas
Date: Wed, 17 Dec 2014 09:09:20 +0800	[thread overview]
Message-ID: <87egrznl9e.fsf@ericabrahamsen.net> (raw)
In-Reply-To: CALn3zohF_HpHqmaBFWHHmgcOEJBXhundsoDdo5qu9__X6VhkXA@mail.gmail.com

Michael Brand <michael.ch.brand@gmail.com> writes:

> Hi Eric
>
> This answers only one of your questions:
>
> On Tue, Dec 16, 2014 at 5:21 AM, Eric Abrahamsen
> <eric@ericabrahamsen.net> wrote:
>> #+BEGIN_SRC emacs-lisp
>>   (defmath uconvert (expr target-units)
>>     (math-convert-units expr target-units))
>> #+END_SRC
>
> I would prefer
>
> #+BEGIN_SRC emacs-lisp
>   (defmath uconv (expr target-units &optional pure)
>     (math-convert-units expr target-units pure))
> #+END_SRC
>
>
>> | km    | ft                  |
>> |-------+---------------------|
>> | 2.5km | uconvert(2.5 km ft) |
>> #+TBLFM: $2=uconvert($1 ft)
>
> Calc syntax uses comma to separate the function arguments, see
> examples in e. g.
> http://orgmode.org/manual/Formula-syntax-for-Calc.html

I was hoping I'd made a more interesting mistake than that! Thanks for
clearing that up.


> | km     | ft           |
> |--------+--------------|
> | 2.5 km | 8202.0997 ft |
>
> #+TBLFM: $2 = uconv($1, ft)
>
> Btw, to have the units only in the column header:
>
> |  km |        ft |
> |-----+-----------|
> | 2.5 | 8202.0997 |
>
> #+TBLFM: $2 = uconv($1 * @<$1, @<$2, t)
>
> The same without a user's defmath:
>
> |  km |        ft |
> |-----+-----------|
> | 2.5 | 8202.0997 |
>
> #+TBLFM: $2 = usimplify($1 * @<$1 / @<$2)

Wow, interesting stuff. I had no idea...

I'd still like to provide a small patch to the documentation, alerting
users to the fact that units work out of the box. Does anyone have any
opinions on including a defmath for `math-convert-units'? (The 'pure
variant seems like a fine choice.)

Lastly, is there a way to both use output formatting, and retain the
unit name (if desired)? Right now I get this:

| km    | units | conversion |
|-------+-------+------------|
| 2.5km | ft    |    8202.10 |
#+TBLFM: $3=uconvert($1, $2); %.2f


Ie, the "ft" falls off the results when I add the "%.2f". Is it possible
to retain that and have formatting?

Eric

  reply	other threads:[~2014-12-17  1:04 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-12-16  4:21 getting calc-units working in table formulas Eric Abrahamsen
2014-12-16  6:33 ` Eric Abrahamsen
2014-12-16 13:06 ` Michael Brand
2014-12-17  1:09   ` Eric Abrahamsen [this message]
2014-12-17  6:39     ` Michael Brand
2014-12-17  7:02       ` Eric Abrahamsen
2014-12-18 10:07         ` [PATCH] " Eric Abrahamsen
2014-12-20 16:33           ` Nicolas Goaziou
2014-12-21  4:22             ` Eric Abrahamsen

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