https://bugs.kde.org/show_bug.cgi?id=455808
Bug ID: 455808
Summary: xyFitCurve not showing expected best-fit line to an
upside down U shape data when using 2nd degree
polynomial fit.
Product: LabPlot2
Version: 2.9.0
Platform: Microsoft Windows
OS: Microsoft Windows
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: alexander.se...@web.de
Reporter: ljbe...@zoho.com
Target Milestone: ---
Created attachment 150065
--> https://bugs.kde.org/attachment.cgi?id=150065&action=edit
Shows unexpected best-fit curve
SUMMARY
***
Unable to produce a best-fit curve to a negative polynomial shape data (upside
down U shape).
***
Data:
50, 10.9
40, 12.4
30, 18.9
20, 25.5
10, 27.4
0, 28.8
-10, 27.9
-20, 23.4
-30, 21.6
-40, 16.8
-50, 12.9
STEPS TO REPRODUCE
1. File>New>Spreadsheet
2. Enter data
3. Select columns
4. Right-Click, Analyze and Plot Data
5. Change xy-curve to show points instead of line
6. Change xy-fitCurve to Basic Functions; Polynomial; Degree 2
OBSERVED RESULT
EXPECTED RESULT
SOFTWARE/OS VERSIONS
Windows:
macOS:
Linux/KDE Plasma:
(available in About System)
KDE Plasma Version:
KDE Frameworks Version:
Qt Version:
ADDITIONAL INFORMATION
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