For a line chart, its is possible to open a dialog box in order to create a trend line (for example, a linear regression line). However, the fields for extrapolating the trend line before and/or after the given data points are not working. The expected behaviour would be to add extra data points in the X-axis before and/or after the given points, thus expanding the chart.
bisected with bibisect-42max and it looks like these parameters was added by Tomaz. Adding him to CC. It never worked as user describe, not sure if it should work as he wrote. @Tomaz: is it bug or not? source-hash-dd5c0b2db451ff4d6fac7a72770758513583d468 commit dd5c0b2db451ff4d6fac7a72770758513583d468 Author: Tomaž Vajngerl <quikee@gmail.com> AuthorDate: Sun Jun 9 12:07:16 2013 +0200 Commit: Tomaž Vajngerl <quikee@gmail.com> CommitDate: Wed Jul 3 21:46:42 2013 +0200 Added new regression curve properties as ODT 1.2 extended. Added: - regression-extrapolate-forward - regression-extrapolate-backward - regression-max-degree - regression-min-degree - regression-moving-type - regression-period - regression-force-intercept - regression-intercept-value Not all of these are yet filled as they are not yet implemented.
Well it's not that extrapolate doesn't work - extrapolation works, but AFAIKS there is no way to extend the chart to show values beyond the values of the data, like you can do with XY chart. The chart also doesn't take into account that it needs to extend the X-axis values beyond the data values automatically (in any kind of chart types). So the main bug is just to take account of the extrapolation values when determining what the X-axis values of the chart should be shown. The work-around for this is that that instead of line chart just use XY chart where you define what X-axis values are shown.
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