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Subject: [OASIS Issue Tracker] (OFFICE-3936) logarithmic scale misses information about basis

• From: OASIS Issues Tracker <workgroup_mailer@lists.oasis-open.org>
• To: office@lists.oasis-open.org
• Date: Mon, 16 Oct 2017 20:39:54 +0000 (UTC)

```    [ https://issues.oasis-open.org/browse/OFFICE-3936?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=67860#comment-67860 ]

Andreas Guelzow commented on OFFICE-3936:
-----------------------------------------

Combining the last two comments, my proposal is:

20.27 The chart:interval-major attribute specifies major intervals on an axis 11.8.
If the axis is linear and the value of this attribute is x, major ticks are placed at n*x for n being any (positive, negative or zero) integer.
If the axis is logarithmic and the value of this attribute is x, major ticks are placed at 10^(n*x) for n being any (positive, negative or zero) integer. (Note: if x = log_{10}(y), then 10^(n*x) = y^n.)

20.28 The chart:interval-minor-divisor attribute specifies a divisor for the chart:interval-major value, the division of which determines the minor interval: If a and b are the locations of consecutive major ticks (see 20.27) and m is the value of chart:interval-minor-divisor then the minor ticks are placed at a + (b-a)/m * k with k = 1,2, ..., (m-1).

> logarithmic scale misses information about basis
> ------------------------------------------------
>
>                 Key: OFFICE-3936
>                 URL: https://issues.oasis-open.org/browse/OFFICE-3936
>             Project: OASIS Open Document Format for Office Applications (OpenDocument) TC
>          Issue Type: Improvement
>          Components: Chart
>    Affects Versions: ODF 1.2
>            Reporter: Regina Henschel
>             Fix For: ODF 1.3
>
>
> http://docs.oasis-open.org/office/v1.2/os/OpenDocument-v1.2-os-part1.html#property-chart_interval-major
> Although the basis 10 is widely used, others a common too, e.g basis 2 for audiogram.
> This proposal adds not only the basis but additional details to the description of chart:interval-major and chart:interval-minor-division.
> Specifications are not only read by developers but by authors of guides and tutorials too. For those the mathematic impact of the attributes values might be not obvious.
> Formulas in the proposal are written StarMath.
> I think, that logarithmic scale should only be allowed for a value-axis, but have not included that in this proposal.

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