https://bugs.freedesktop.org/show_bug.cgi?id=53875
Bug #: 53875
Summary: CONFIGURATION: B-spline option in charts wrongly
interpolates data instead of smoothing them!
Classification: Unclassified
Product: LibreOffice
Version: 3.6.0.4 release
Platform: Other
OS/Version: All
Status: UNCONFIRMED
Status Whiteboard: BSA
Severity: normal
Priority: medium
Component: Spreadsheet
AssignedTo: [email protected]
ReportedBy: [email protected]
Problem description: in a chart, the B-spline option should produce a composite
function that does NOT pass through all given data points (that's the business
of the cubic spline), but instead goes through them with a smoothed behaviour.
That's what it did until 3.4, and it was quite useful.
Now since some not totally clear remake of it, it interpolates all data points,
just as a normal spline, but it should not do this.
So now the two options "cubic spline" and B-spline" in the chart options give
uselessly equivalent results.
I tried to understand the motivations behind the change in 3.5 documentation
but failed.
Anyway the fact is that a very nice option is totally gone, and you cannot
recreate it manually, since the points shown on the chart with this options are
not computable through any calc function.
What's worse, if you open old .ods files with such charts and correct b-spline
showing, they are automatically updated to the new uncorrect interpolating
instead of smoothing version.
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