From: Uwe Brauer <oub@mat.ucm.es>
To: emacs-orgmode@gnu.org
Subject: [SOLVED] (was: (ledger?) The fair Christmas problem: splitting expenses automatically)
Date: Thu, 30 Dec 2021 18:55:54 +0100 [thread overview]
Message-ID: <87o84yaset.fsf@mat.ucm.es> (raw)
In-Reply-To: 87o84zs88r.fsf@mat.ucm.es
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>>> "UB" == Uwe Brauer <oub@mat.ucm.es> writes:
> Hi
> I am not sure whether this is the right place to ask this, but anyhow.
> Suppose two friends want to buy Christmas presents, but when they have
> finished, they want to have spent the same amount of money. If they
> don't a compensation must be transferred.
> Here is an example
> ** Start
> #+name: presents
> #+begin_src ledger
> 2010/01/01 * Starting balance
> assets:bank:savings 0
> income:starting balances
> 2021/12/01 User1:Jacket
> expenses:User1:Jacket 80
> income:User1:creditcard1
> 2010/07/24 User1:Pajama
> expenses:User1:Pajama 30
> income:User1:creditcard1
> 2010/07/23 User2:Flowers
> expenses:User2:Flowers 20
> income:User2:creditcard2
> 2010/07/23 User2:ChristmasTree
> expenses:User2:ChristmasTree 40.00
> income:User2:creditcard2
> #+end_src
> #+RESULTS: presents
> #+begin_example
> 170 expenses
> 110 User1
> 80 Jacket
> 30 Pajama
> 60 User2
> 40 ChristmasTree
> 20 Flowers
> -170 income
> -110 User1:creditcard1
> -60 User2:creditcard2
> --------------------
> 0
> #+end_example
> So user1 spent 110, while user2 spent 60
> ** Compensation manually
> So the compensation is (trivally)
> | User1 | User2 | User2-->Uwer1 |
> |-------+-------+---------------|
> | 110 | 60 | -25 |
> #+TBLFM: $3=($2-$1)/2;f2
> Leading to
> #+name: compensated
> #+begin_src ledger
> 2010/01/01 * Starting balance
> assets:bank:savings 0
> income:starting balances
> 2021/12/01 User1:Jacket
> expenses:User1:Jacket 80
> income:User1:creditcard1
> 2010/07/24 User1:Pajama
> expenses:User1:Pajama 30
> income:User1:creditcard1
> 2010/07/23 User2:Flowers
> expenses:User2:Flowers 20
> income:User2:creditcard2
> 2010/07/23 User2:ChristmasTree
> expenses:User2:ChristmasTree 40.00
> income:User2:creditcard2
> 2010/07/23 User2:User1-Compensation
> expenses:User2:User1-Compensation 25.00
> expenses:User1:User1-Compensation
> #+end_src
> #+RESULTS: compensated
> #+begin_example
> 170 expenses
> 85 User1
> 80 Jacket
> 30 Pajama
> -25 User1-Compensation
> 85 User2
> 40 ChristmasTree
> 20 Flowers
> 25 User1-Compensation
> -170 income
> -110 User1:creditcard1
> -60 User2:creditcard2
> --------------------
> 0
> #+end_example
> The question is can this be done automatically?
> By this I mean
> can
> 2010/07/23 User2:User1-Compensation
> expenses:User2:User1-Compensation 25.00
> expenses:User1:User1-Compensation
> Somehow be generated automatically?
The solution consists of
#+name: compensated
#+begin_src ledger
2010/01/01 * Starting balance
assets:bank:savings 0
income:starting balances
2021/12/01 User1:Jacket
expenses:User1:Jacket 80
income:User1:creditcard1
2010/07/24 User1:Pajama
expenses:User1:Pajama 30
income:User1:creditcard1
2010/07/23 User2:Flowers
expenses:User2:Flowers 20
income:User2:creditcard2
2010/07/23 User2:ChristmasTree
expenses:User2:ChristmasTree 40.00
income:User2:creditcard2
2010/07/23 User2:User1-Compensation
expenses:User2:User1-Compensation ((110-60)*0.5)
expenses:User1:User1-Compensation
#+end_src
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prev parent reply other threads:[~2021-12-30 18:01 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-29 16:09 (ledger?) The fair Christmas problem: splitting expenses automatically Uwe Brauer
2021-12-30 17:55 ` Uwe Brauer [this message]
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