I did my tests with "LibreOffice 3.6.5.2 " German UI/ German Locale [Build-ID: 5b93205] {pull date 2013-01-18} on German WIN7 Home Premium (64bit), but that's all the same for all other versions. Currently LibO does a wrong automatic unit calculation. Introduction: Units have to be integrated into calculation. Examples: You an add 2 Apples + 3 Apples, the result will be 5 apples Aou can't add Apples and Beans, 2 Apples + 3 Beans = 2 Apples + 3 Beans (or may be 5 Apples + Beans) To Calculate the area of a square: 2m * 2m = 4m² To calculate a velocity you divide a distance by a time, 20 km km ----- = 10 ---- 2 h h for Calculations LibO calculation results inherit formatting of parts of calculation. This works correct in Calc for SUM: SUM(2 €;3 €) = 5 € (same correct result for addition 2 € + 3 € = 5 € Division: 2 € / 3 € = 0,66666 without unit This does not work correctly for Multiplications: Current result: 2 € * 3 € = 6 € Should be: = 6 €² This does not work at all for user defined units It would be great to get some more mathematical correctness here.

Can you provide a sample document with this happening as i cant create the necessary scenario.

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Not a calc expert but believe its only doing simple multiplication and doubt multiplying a currency by another currency value should result in currency square. @Qubit, Jmadero, Beluga: what do you guys think?

(In reply to Jay Philips from comment #1) > Can you provide a sample document with this happening as i cant create the > necessary scenario. Rainer is retired from QA, so if we want a test document, we'll have to create one. (In reply to Jay Philips from comment #3) > Not a calc expert but believe its only doing simple multiplication and doubt > multiplying a currency by another currency value should result in currency > square. Rainer's basic premise is correct: If you multiple X dollars by Y dollars, then you should get XY dollars^2 (And no, I don't have a particular real-world scenario in mind for that). An easier use-case would be Acceleration in m/s^2 or something. I'll try creating a test document

Created attachment 112199 [details] Test spreadsheet for calculations involving units

TESTING with Ubuntu 14.04 + LO 4.4.0.2 (In reply to Rainer Bielefeld Retired from comment #0) > Units have to be integrated into calculation. Examples: > ... > This works correct in Calc for > SUM: SUM(2 €;3 €) = 5 € (same correct result for addition > 2 € + 3 € = 5 € > Division: 2 € / 3 € = 0,66666 without unit > > This does not work correctly for Multiplications: > Current result: 2 € * 3 € = 6 € > Should be: = 6 €² > > This does not work at all for user defined units > > It would be great to get some more mathematical correctness here. REPRO: Check out attachment 112199 [details] for an example of the problem with multiplication of numbers bearing units. CONFIRMED: Multiplication of units is not formatted as expected. Status -> NEW Hardware -> (generalize)

Spoke with beluga and matthiew in the IRC about this issue and as "dollars" is a formatting on a cell and when you are doing calculations it is only multiplying the contents in the cell and not its formatting, multiplying "X dollars by Y dollars, ... should get XY dollars^2" is not possible.

(In reply to Jay Philips from comment #7) > Spoke with beluga and matthiew in the IRC about this issue and as "dollars" > is a formatting on a cell and when you are doing calculations it is only > multiplying the contents in the cell and not its formatting, Units are obviously more than just an afterthought in the model we're using in Calc. As Rainer noted: > Addition: 2 € + 3 € = 5 € (Retains units) > Division: 2 € / 3 € = 0,66666 (Loses units) So IMHO we should either 1) Do nothing special to propagate units through a calculation, or 2) Try to push units through a calculation completely correctly, or 3) Clearly and fully document the inconsistency in the Calc Manual and Wikihelp under a new section with a name like "Limitations and Bugs" > multiplying "X > dollars by Y dollars, ... should get XY dollars^2" is not possible. It sounds like we'll have to go with (3).

(In reply to Robinson Tryon (qubit) from comment #8) > Units are obviously more than just an afterthought in the model we're using > in Calc. As Rainer noted: > > > Addition: 2 € + 3 € = 5 € (Retains units) > > Division: 2 € / 3 € = 0,66666 (Loses units) $ 2 / $ 3 = $ 0.66666 if you set the cell formatting of 0.66666 to number format. In attachment 112199 [details], C3 is '0.5' and not '$0.50' because you havent set the cell formatting as 'number' which you did in C2 and C4. Am i missing something?

(In reply to Jay Philips from comment #9) > (In reply to Robinson Tryon (qubit) from comment #8) > > Units are obviously more than just an afterthought in the model we're using > > in Calc. As Rainer noted: > > > > > Addition: 2 € + 3 € = 5 € (Retains units) > > > Division: 2 € / 3 € = 0,66666 (Loses units) > > $ 2 / $ 3 = $ 0.66666 if you set the cell formatting of 0.66666 to number > format. > > In attachment 112199 [details], C3 is '0.5' and not '$0.50' because you > havent set the cell formatting as 'number' which you did in C2 and C4. Am i > missing something? IIRC, I only set the formatting on the data source cells in column A. The formatting of the cells in column C was automatically decided by the result of my computations and (I assume) LibreOffice pushing units.

This bug fixes number formats with units. We don't have units which would support stuff like km/h, ... and instead all that we have is number formats which specifies how to represent a number. That some number formats (if none is set yet) is determined by the formula interpreter is a feature to make it easier. Here is no bug. The plan to introduce an unit system has been discussed and there exist some plans but for the current number formats this is clearly not a bug.

(In reply to Robinson Tryon (qubit) from comment #10) > IIRC, I only set the formatting on the data source cells in column A. The > formatting of the cells in column C was automatically decided by the result > of my computations and (I assume) LibreOffice pushing units. You are correct here. With the division operator, it doesnt transfer the cell formatting to the cell.

(In reply to Markus Mohrhard from comment #11) > This bug fixes number formats with units. We don't have units which would > support stuff like km/h, ... and instead all that we have is number formats > which specifies how to represent a number. > > That some number formats (if none is set yet) is determined by the formula > interpreter is a feature to make it easier. > > Here is no bug. The plan to introduce an unit system has been discussed and > there exist some plans but for the current number formats this is clearly > not a bug. What's our documentation like of the current behavior? I don't see anything in the latest Calc manual: https://wiki.documentfoundation.org/images/4/47/CG41-CalcGuideLO.pdf