[Kst] [Bug 224202] New: fit linear plugin doesn't work when one or more points are not valid

[freebody.kst at gmail.com]

https://bugs.kde.org/show_bug.cgi?id=224202

           Summary: fit linear plugin doesn't work when one or more points
                    are not valid
           Product: kst
           Version: unspecified
          Platform: Compiled Sources
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
        AssignedTo: kst at kde.org
        ReportedBy: freebody.kst at gmail.com


Version:            (using Devel)
OS:                Linux
Installed from:    Compiled sources

PROBLEM:
fit linear plugin cannot produce fit result when one or more points are not
valid

STEPS TO REPRODUCE:
1. Create 3 vectors X, Y, DelY from source file 'fittest.dat' located in
graphics/kst/tests/data_files
Data --> New Vector...
configure: data starts at line 0 (by doing so, the first point of all 3 vectors
will be invalid)
2. construct a curve
1.Data --> New Curve...
Choose X from the drop-down list for the X axis vector
Choose Y from the drop-down list for the Y axis vector
Choose DelY from the drop-down list for the +Y error bar
Check Show points in the Appearance panel
Create a new tab: “fitting demo” from the New... button in the Placement panel
Click OK to view the curve

3. curve fitting
Click anywhere on the plot 
Choose Fit --> Y in the appearing context menu
Choose Fit linear(v0.1) in the drop down list of Plugin Selection
Click OK 



RESULTS:
no fit result

EXPECTED RESULTS:
the plugin should ignore these invalid points. The 'fit linear weighted' plugin
is able to ignore these invalid points and produce a result in this case.

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