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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, 2 Oct 2017 23:25:54 +0000 (UTC)

[ https://issues.oasis-open.org/browse/OFFICE-3936?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Regina Henschel updated OFFICE-3936: ------------------------------------ Proposal: 20.27 Add "for details see 20.28." to the first sentence. The wording would then be The chart:interval-major attribute specifies major intervals on an axis 11.8, for details see 20.28. 20.28 Add the following text before the last sentence. Let a be the value at a major grid line and b the value at the next major grid line and m the value of the attribute chart:interval-major. For an axis with proportional scale it is m = b - a, for an axis with logarithmic scale it is m = log_10(b) - log_10(a) = log_10(b over a). The distance D, measured e.g. in centimeter, between a pair of two adjacent major grid lines is the same for all such pairs. Let n be the value of the attribute chart:interval-minor-divisor, and x_k the value at the k-th minor grid line with a < x_k < b. Then for both kind of scale it is x_k = a + {{b - a} over n} cdot k . But the distance d, measured e.g. in centimeter, from the major grid line at value a to the k-th minor grid is different. For an axis with proportional scale it is d = D cdot {k over n} = {D over m} cdot (x_k-a) For an axis with logarithmic scale it is d = {D over m} cdot (log_10(x_k) - log_10(a)) was: 20.27 Add "for details see 20.28." to the first sentence. The wording would then be The chart:interval-major attribute specifies major intervals on an axis 11.8, for details see 20.28. 20.28 Add the following text before the last sentence. Let a be the value at a major grid line and b the value at the next major grid line and m the value of the attribute chart:interval-major. For an axis with proportional scale it is m = b - a, for an axis with logarithmic scale it is m = log_10(b) - log_10(a) = log_10(b over a). The distance D, measured e.g. in centimeter, between a pair of two adjacent major grid lines is the same for all such pairs. Let n be the value of the attribute chart:interval-minor-divisor, and x_k the value at the k-th minor grid line with a < x_k < b. Then for both kind of scale it is x_k = a + {{b - a} over n} cdot k . But the distance d, measured e.g. in centimeter, from the major grid line at value a to the k-th minor grid is different. For an axis with proportional scale it is d = D cdot {k over n} = {D over m} cdot (x_k-a) For an axis with logarithmic scale it is d = {D over {log_10(m)}} cdot (log_10(x_k) - log_10(a)) > 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)

**Follow-Ups**:**Re: [office] [OASIS Issue Tracker] (OFFICE-3936) logarithmic scale misses information about basis***From:*Regina Henschel <regina.henschel@libreoffice.org>

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