https://bugs.documentfoundation.org/show_bug.cgi?id=110993
Stéphane Guillou (stragu) <stephane.guil...@libreoffice.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|Chart produces incorrect |cubic spline interpolation
|graph w/ some negative |produces incorrect graph w/
|points when using large |some negative points when
|positive values in source |using large positive values
|cells |in source cells
Blocks| |94587
--- Comment #30 from Stéphane Guillou (stragu)
<stephane.guil...@libreoffice.org> ---
Clarified the summary to include "cubic spline".
But I stand by my comment 25 and comment 28: there are various ways to
calculate cubic splines, and the method LibreOffice uses is consistent with the
"Normal" method. Other alternative methods will also extrapolate this kind of
data to negative values.
The use of R for comparison is not a random choice: it's a statistical
programming language used very widely.
If something needs to be checked, it's the consistency between the LibreOffice
code and the ODF standard (i.e. are we using the method that the standard
defines?).
In summary, my opinion is "resolved - not a bug" because negative values are
expected in some (most?) cubic spline methods applied to this data.
Referenced Bugs:
https://bugs.documentfoundation.org/show_bug.cgi?id=94587
[Bug 94587] [META] Properly support existing ODF features
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