Hi! I'm checking out Labplot2 2.5.0 (last sync and installation, 2018/04/16). When you try to fit your data to a custom non-linear equation, like Michaelis-Menten's [Vm*x/(Km+x)], and your spreedsheet contains the initial (0,0) pair of data, you get this failure: "Fit status: Iteration is no making progress towards solution". When you remove (0,0), fitting proceeds.
Git commit bc977b884f2fe68e2b949a2093332e58434a2ff5 by Stefan Gerlach. Committed on 22/04/2018 at 10:42. Pushed by sgerlach into branch 'master'. 1. fixed bug in finite difference calculation for custom fitting models 2. add test for bug 393213 FIXED-IN: 2.5 M +6 -4 src/backend/worksheet/plots/cartesian/XYFitCurve.cpp M +58 -0 tests/analysis/fit/FitTest.cpp M +3 -1 tests/analysis/fit/FitTest.h https://commits.kde.org/labplot/bc977b884f2fe68e2b949a2093332e58434a2ff5
(In reply to Stefan Gerlach from comment #1) > Git commit bc977b884f2fe68e2b949a2093332e58434a2ff5 by Stefan Gerlach. > Committed on 22/04/2018 at 10:42. > Pushed by sgerlach into branch 'master'. > > 1. fixed bug in finite difference calculation for custom fitting models > 2. add test for bug 393213 > FIXED-IN: 2.5 > > M +6 -4 src/backend/worksheet/plots/cartesian/XYFitCurve.cpp > M +58 -0 tests/analysis/fit/FitTest.cpp > M +3 -1 tests/analysis/fit/FitTest.h > > https://commits.kde.org/labplot/bc977b884f2fe68e2b949a2093332e58434a2ff5 Thanks!