support rounding postings with arithmetic

[maxheld83]

I sometimes enter postings like so:

1970-01-01 * "coffee"
  Expenses:Food:Net           2.13 / 1.19 EUR
  Expenses:Food:Taxes  2.13 / 1.19 * 0.19 EUR ; for example to calculate tax
  Assets:Cash

For example, such a transaction may be necessary to impute a VAT share which wasn't explicitly listed on a receipt.

This will become:

1970-01-01 * "coffee"
  Expenses:Food:Net   1.789915966386555 EUR
  Expenses:Food:Taxes 0.340084033613445 EUR
  Assets:Cash

The trouble with this is, that I now have too many decimal places in my transaction,
which may then continue to mess up tolerance calculations.
And anyway: it's wrong -- the amounts were, in fact, rounded upon payment.

It would be nice if I could somehow express that I want the results of some arithmetic to be rounded, perhaps by either:

1. leveraging the ~ syntax (i.e. 2.13 / 1.19 ~ 0.01 EUR)
2. ignoring the significant digits resulting from numbers entered via arithmetic (analogous treatment to costs)
3. allowing some more python syntax like round() (might open a can of worms)

[blais]

Why don't you make yourself a plugin that does this for you? I think one thing that might be interesting would be to define a division operator that quantizes to the declared precision automatically, like /. Or something like that

…

On Tue, Dec 12, 2023, 10:38 Max Held ***@***.***> wrote: I sometimes enter postings like so: 1970-01-01 * "coffee" Expenses:Food:Net 2.13 / 1.19 EUR Expenses:Food:Taxes 2.13 / 1.19 * 0.19 EUR ; for example to calculate tax Assets:Cash For example, such a transaction may be necessary to impute a VAT share which wasn't explicitly listed on a receipt. This will become: 1970-01-01 * "coffee" Expenses:Food:Net 1.789915966386555 EUR Expenses:Food:Taxes 0.340084033613445 EUR Assets:Cash The trouble with this is, that I now have too many decimal places in my transaction, which may then continue to mess up tolerance calculations. And anyway: it's wrong -- the amounts were, in fact, rounded upon payment. It would be nice if I could somehow express that I want the results of some arithmetic to be rounded, perhaps by either: 1. leveraging the ~ syntax (i.e. 2.13 / 1.19 ~ 0.01 EUR) 2. ignoring the significant digits resulting from numbers entered via arithmetic (analogous treatment to costs) 3. allowing some more python syntax like round() (might open a can of worms) — Reply to this email directly, view it on GitHub <#795>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AACSBE7C2OFZZAFAJQO47KLYJCB7XAVCNFSM6AAAAABARYT33GVHI2DSMVQWIX3LMV43ASLTON2WKOZSGAZTQMJWGA4DENI> . You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>

[blais]

Added here: https://docs.google.com/document/d/1qPdNXaz5zuDQ8M9uoZFyyFis7hA0G55BEfhWhrVBsfc/edit#heading=h.ub6cn7jl1vq