EasySpin forum

I have found that for some files experimental spectrum looks like scaled by negative factor. It is clearly visible on screenshot.

This behaviour is kept at any scaling mode, except 'no scaling' which throws an error

Undefined function or variable "scalefactor".
Error in C:\easyspin-5.2.30\easyspin\rescale.p>rescale (line 140)
Error in C:\easyspin-5.2.30\easyspin\esfit.p>assess (line 843)
Error in C:\easyspin-5.2.30\easyspin\esfit_simplex.p>esfit_simplex (line 77)
Error in C:\easyspin-5.2.30\easyspin\esfit.p>runFitting (line 681)
Error while evaluating uicontrol Callback

For the other files with the same system esfit works properly (except error with no scaling).
I override the problem using Sys.weight=-1 where appropriate, but it does not look like good solution.

Please post the experimental data and the simulated spectrum that give the negative rescaling, and we'll look into this issue.

Sorry, Stefan, the first issue isn't a bug in esfit. Real reason is incorrect units for Exp.Temperature (C instead of K) for custom simulation function. Correction of the temperature units solves the problem.
However, second issue is still actual. Example script basicfit.m with 'no scaling' throws an error

Undefined function or variable "scalefactor".
Error in C:\easyspin-5.2.30\easyspin\rescale.p>rescale (line 140)
Error in C:\easyspin-5.2.30\easyspin\esfit.p>assess (line 843)
Error in C:\easyspin-5.2.30\easyspin\esfit_simplex.p>esfit_simplex (line 77)
Error in C:\easyspin-5.2.30\easyspin\esfit.p>runFitting (line 681)
Error while evaluating uicontrol Callback

It seems to be a bug.

Yes, this is a bug, thanks for reporting. It will be fixed in the next patch release, 5.2.31