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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*: Sun, 22 Oct 2017 20:17:54 +0000 (UTC)

[ https://issues.oasis-open.org/browse/OFFICE-3936?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=67918#comment-67918 ] Andreas Guelzow commented on OFFICE-3936: ----------------------------------------- I think we should: 1) introduce an "origin" value for the major ticks (whose value for LO would default to the minimum for the axes and for Gnumeric to 0 or 1 depending on linear or logarithmic axes). 2) introduce a flag to indicate whether the minor ticks are equally spaced before or after the logarithmic transformation So this would become: 20.xx The chart:major-origin attribute (a decimal value) specifies the location of one major tick. 20.xx The chart:minor-logarithmic attribute (a true/false value) specifies whether the minor ticks are spaced equally after the logarithmic transformation. If this value is false they are spaced equally before the transformation. 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 with the value of chart:major-origin being w, major ticks are placed at w+n*x for n being any (positive, negative or zero) integer. If the axis is logarithmic and the value of this attribute is x with the value of chart:major-origin being w, major ticks are placed at w*(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 chart:minor-logarithmic is false the ticks are placed as follows: If a and b are the values of consecutive major ticks (see 20.27) and m is the value of chart:interval-minor-divisor then the minor ticks are placed at locations corresponding to the values a + (b-a)/m * k with k = 1,2, ..., (m-1). So the minor ticks are equally spaced before the logarithmic transformation. If chart:minor-logarithmic is true the ticks are placed as follows: If a and b are the values of consecutive major ticks (see 20.27) and m is the value of chart:interval-minor-divisor then the minor ticks are placed at locations corresponding to the values a*((b/a)^(k/m)) with k = 1,2, ..., (m-1). So the minor ticks are equally spaced after the logarithmic transformation. > 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. -- This message was sent by Atlassian JIRA (v6.2.2#6258)

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