Bad math in exchange rates (transfer dialog)
Derek Atkins
warlord at MIT.EDU
Sat Jul 12 11:07:51 CDT 2003
In all this you never state what version of GnuCash you are using.
However, I did test this with 1.8-CVS and the problem is still there.
Most likely the problem is that the rate calculations are limited to 6
decimal spaces, causing rounding to occur..
So, yes, please file a bug report.
-derek
Daniel Hannum <dhannum at magicdan.net> writes:
> Somebody let me know if I should file a bug. Gnucash appear to be
> doing its math wrong when you transfer money from a normal asset
> account (USD) to a stock asset account (with some other commodity)
>
> 1. Make a new commodity
> 2. Make a new stock account that uses that commodity
> 3. Transfer money from any USD asset account to that stock account
> 4. Enter 6.50 as the amount
> 5. Set the accounts appropriate. The currency transfer part of the
> dialog will enable itself
> 6. Enter 0.644 as the 'to-amount'
> 7. Click back in the amount field and Gnucash will compute the price
> 8. Gnuash says that "1 foo = 10.092854 USD"
> 9. My calculator, however, says that the price should be 10.093168
>
> That was a real world example. You might ask why I care about tenths
> of a cent. Here is a better contrived one that is obvious
> Enter 1746.08 as the amount
> Enter 56 as the 'to-amount'
> The price should be *exactly* 31.18, but Gnucash says 31.181790
>
> If hit Ok, and then try to make another transfer of 31.18 (1
> share). Gnucash tries to help and puts "0.9999" in the to-amount box
> for me. So then I have to go in and fix it.
>
> All of the stock accounts in question track commodities to 1/10000,
> which should be more than enough precision.
>
> Thanks
>
> dan
>
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--
Derek Atkins, SB '93 MIT EE, SM '95 MIT Media Laboratory
Member, MIT Student Information Processing Board (SIPB)
URL: http://web.mit.edu/warlord/ PP-ASEL-IA N1NWH
warlord at MIT.EDU PGP key available
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