https://bugs.kde.org/show_bug.cgi?id=386800
Uwe Stöhr <uwesto...@web.de> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|WORKSFORME |---
Status|NEEDSINFO |CONFIRMED
--- Comment #22 from Uwe Stöhr <uwesto...@web.de> ---
> The parameter a is very sensitive. The fit works for me using start values
> closer to the result (b=2, a=.05, c=2).
;-) Well, people use LabPlot because they don't yet the solution. using 1 for
all 3 parameters is sensible because one can expect that the solution will have
positive values and that b and c won't be very high.
However, I restarted now from scratch using RC17 and this recipe:
- create a new table with 2 columns
- fill the table columns with row numbers
- create a new custom fit
- use as fit function this one
exp(b*sin(a*x))+c
- set fit interval x:10 - 25
- set as start value for all parameters "1"
result: one doesn't get a fit curve
What is missing is that LabPlot does not draw the cureve for A=b=c=1
immediately, meaning even before starting the calculation of the fit. Other
programs like MagicPlot do this since it helps a lot to see if the start
parameters are sensible.
With RC17 the fitting result are now correct but as long as LabPlot does not
draw the fit curve with the given start parameters, the problem is not fixed in
my opinion.
Btw. with RC17 LabPlot does no longer show any fit curve. I'll open new bug
reports now.
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