From: Eric Abrahamsen <eric@ericabrahamsen.net>
To: emacs-orgmode@gnu.org
Subject: Re: getting calc-units working in table formulas
Date: Tue, 16 Dec 2014 14:33:44 +0800 [thread overview]
Message-ID: <87a92oqf1z.fsf@ericabrahamsen.net> (raw)
In-Reply-To: 87oar4ql5t.fsf@ericabrahamsen.net
Eric Abrahamsen <eric@ericabrahamsen.net> writes:
> I've been playing with calc-units, and it's pretty amazing. See all the
> units with `calc-view-units-table'.
>
> Some calc-units stuff works out the box (maybe have to require
> calc-units?), I think this should be mentioned in the manual:
>
> | distance | time | speed |
> |----------+--------+-------------|
> | 3 km | 2.5 hr | 1.2 km / hr |
>
> #+TBLFM: @2$3=$1/$2
>
> Who knew it could do that?! Probably everyone but me... It doesn't need
> the constants.el package, and looks nicer in the input, to boot.
>
> calc-units makes a few of its functions available via defmath:
>
> | speed | simplified speed |
> |--------------+------------------|
> | 40km / 2.5hr | 16. km / hr |
> | | |
>
> #+TBLFM: @2$2=usimplify($1)
>
> But it's got a lot more tricks. I think unit conversion would be very
> handy to have, but there's something I'm not getting about using
> defmath. For instance, this works:
>
> | km | ft |
> |-------+---------|
> | 2.5km | 8202.10 |
>
> #+TBLFM: $2='(calc-eval (math-convert-units (calc-eval $1 'raw) (calc-eval "ft" 'raw))); %.2f
I wonder if the problem is the 'raw in here. To the best of my
knowledge, calc-eval needs that 'raw flag to work properly with this.
But it doesn't look like `org-table-eval-formula' will ever send that
flag. I hope someone who knows this code better than me can comment...
next prev parent reply other threads:[~2014-12-16 6:28 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 [this message]
2014-12-16 13:06 ` Michael Brand
2014-12-17 1:09 ` Eric Abrahamsen
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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