[Pkg-kde-extras] Bug#974566: Bug#974566: labplot: Labplot fails to perform curve fitting with custom functions

[Marcel Ilg]

Hello Pino,

Am 12.11.20 um 12:44 schrieb Pino Toscano:
> Hi Marcel,
>
> In data giovedì 12 novembre 2020 11:24:09 CET, Marcel Ilg ha scritto:
>> it semms that labplot has some issues with it's curve fitting uttility.
>>
>> When trying to fit a curve based on data from a table it succedes when using
>> one of the provided basic functions but when using a custom function it's not
>> able to perform the fit. The field where the custom equation is written stays
>> red and the fit does not succede.
>> Additionally after trying to perform a custom fit, it is impossible to fit
>> any curve using a predefined fit model like polinomials. No fit will appear
>> and the constants stay at their starting value.
>>
>> To recreate this:
>> Open labplot, create new document, create new table, put values into the table,
>> make a plot from the table data, switch off the lines of the plot and use
>> symbols instead, try to fit the curve (if there is some basic function selected
>> the fit will succede here), try to fit using custom equation
>>
>> Result:
>> No fit will be performed, the field where the custom equation is written stays
>> red. After this action fits using predefined model curves
>> like polynomials will also not be performed.
> I just uploaded labplot 2.8.1 (mostly a bugfix release) to unstable,
> and hopefully it should be available in the archive in 4 hours or so.
> Once it is updated for you, can you please try again with the new
> version?
> In case the issue still persists with the new version, can you please
> report the bug directly to the upstream developers? See the page
> https://labplot.kde.org/support/ with pointers.
>
> Thanks,

I have just received the new version, unfortunately lab plot is still 
unable to do
custom fits and afterwards unable to fit at all.

I'm going to write a bug report to the upstream developers this evening.

Thanks for your help,

Marcel