https://bugs.kde.org/show_bug.cgi?id=386800
urcind...@gmail.com changed:
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--- Comment #17 from urcind...@gmail.com ---
Created attachment 112508
--> https://bugs.kde.org/attachment.cgi?id=112508&action=edit
test as described by OP
I'm not the original poster, but I tried what he suggests in the opening
message with a recent compilation, a few minutes ago:
===
GIT update -->
repository: https://anongit.kde.org/labplot
updating from commit: 9ba9b2636a94ec4c53dba369c922cb5b482c8333
to commit: ed4021f2e459ab4cbc8ff4ff5a9c7b2d5c908924
===
My findings:
1) When entering the parameter initial values, b fields turn red when entering
1. However, it is accepted: after pressing "Apply" and entering into Options
again, b=1 is there and b fields are no longer red.
2) The reason for it to turn red is both b and a have default lower and upper
limits equal to 0, whilst you are telling labplot their value is 1.
3) If you then perform the fitting, c=1 and both a and b get the same huge
value: ~1.8e308
4) However, if you change the default 0 for both lower and upper limits (bug?)
to none, set the starting value to 1 for the three parameters and perform the
fitting, then you get distinct values for them. The fitting is not good, as you
can see in the attached file, because probably you would need to set more
realistic starting values, but I would say this is a normal behavior for such a
function.
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