[Libreoffice-bugs] [Bug 128995] New: Chart: Trend Line shows wrong linear Equation

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=128995

            Bug ID: 128995
           Summary: Chart: Trend Line shows wrong linear Equation
           Product: LibreOffice
           Version: 5.1.5.2 release
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: Calc
          Assignee: libreoffice-bugs at lists.freedesktop.org
          Reporter: robert at familiegrosskopf.de

Created attachment 156075
  --> https://bugs.documentfoundation.org/attachment.cgi?id=156075&action=edit
Open the attached Calc-file and have a look at the equation.

Open the attached Calc-file.
There are values created for a x-y-chart with y=2.8*x
The chart has been created, the trend line also and the equation also.
The equation is wrong, shows f(x)=2.8x - 2.14...E-15.
Change the value in the chart from 2.80 € to 2.60 €.
Equation is right.
You have to switch "Force Intercept" to "0" to get the right equation also with
2.80 €.
Trend line doesn't recognize the right "start values" every time ...

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