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From: Daniele Nicolodi <daniele@grinta.net>
To: emacs-orgmode@gnu.org
Subject: Re: org-tables with monetary amounts
Date: Fri, 9 Oct 2020 18:14:08 +0200
Message-ID: <ba19b158-b9d8-c9d8-fad4-98d97d431d5e@grinta.net> (raw)
In-Reply-To: <87wo0jttxz.fsf@christianmoe.com>

Hello Christian,

thank you for your input. calc support for units indeed covers the
basics of working with currencies. I gave it a spin on some notes I have
been working on recently. While some things work very nicely, other are
a bit ugly. It is a good start and I'll explore this approach more.

On 24/09/2020 11:17, Christian Moe wrote:

> Now, with the Calc command to simplify units, you can add dollars to
> euros and get the result in whichever currency comes first in the
> algebraic expression
> 
>   | 3 USD | 4 EUR | 6.58 EUR |
>   #+tblfm: $3=usimplify($2+$1)
> 
>   | 3 USD | 4 EUR | 7.6511628 USD |
>   #+tblfm: $3=usimplify($1+$2)

Having to explicitly use usimplify() is a bit too verbose. It would be
ideal if this could be somehow be implicit.

> I don't use this functionality, so I don't have answers to all the
> questions you'll now have -- including how to get the desired precision
> without lopping off the currency unit in the last example!

Having the desired fixed precision is quite important for this to be
useful. In y recent tests I had to drop the units (currencies) to
achieve this. It would be nice to find a way to avoid it.

> There are ways to enter user-defined units permanently. But exchange
> rates change, so to use this functionality on a daily basis, you'll want
> to have some kind of function to pull exchange rates and update the
> currency unit definitions in the Calc init file.

Computations usually refer to a specific point in time, thus this is npt
a big problem in practice. I already have scripts to pull exchange rates
at a given date. These can the be inserted as a property that can be
easily references from the computations.

> Apart from `usimplify', most Calc functions on units appear (?) to be
> missing corresponding algebraic versions that you can use in Calc
> expressions in Org tables, which limits the usefulness.
> 
> Org tables don't seem to have any specific formula syntax for leveraging
> Calc unit operations apart from what happens to work out of the
> box. This might be an area for improvement, though I'm not sure what to
> ask for.

I don't understand what you mean in the two paragraphs above. Can you
please clarify, maybe with examples?

Thank you.

Cheers,
Dan


  parent reply	other threads:[~2020-10-09 16:21 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-22 14:57 Daniele Nicolodi
2020-09-22 23:25 ` Nicholas Savage
2020-09-23  9:37 ` Russell Adams
2020-09-23 16:55 ` Eric S Fraga
2020-09-25 11:20   ` Daniele Nicolodi
2020-09-25 11:57     ` Alan Schmitt
2020-09-23 21:26 ` Nick Dokos
2020-09-24  9:17 ` Christian Moe
2020-09-24 11:47   ` Eric S Fraga
2020-10-09 16:14   ` Daniele Nicolodi [this message]
2020-10-12  8:22     ` Christian Moe
2020-10-12  9:43       ` Eric S Fraga
2020-10-13  7:10         ` Derek Feichtinger
2020-10-14  7:38           ` Christian Moe
2020-10-15 20:02       ` Daniele Nicolodi
2020-09-25  9:25 ` Neil Jerram
2020-09-25 11:35   ` Daniele Nicolodi
2020-09-26 18:38     ` Neil Jerram

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