EasySpin forum

Greetings,
I started trying to fit a set of magnetization curves with curry and esfit.
If I use Opt.Scaling = 'none', I get an error when starting the fitting in interactive mode:

Unrecognized function or variable 'scalefactor'.

Error in rescale

Error in esfit

Error in esfit_simplex

Error in esfit

Error while evaluating UIControl Callback.

But if I don't include that option it works fine, although then the fitting parameters would not make sense, because the g value dependence is on the maximum values of the magnetization. This also happens if I just change to No scaling in the interactive esfit window.
Is this a bug?
I have version 5.2.28
Best wishes,
Nicolas

Can you please post a minimal script that reproduces the problem, along with the experimental data you are trying to fit?

Hi,

I noticed the same problem with version 5.2.29. However, it runs after reverting to 5.2.25. The curry_fit.m example file from the examples folder does not run the fitting because of this error message.

I also noticed that the onecoloumn option is gone in the development version 6.0. Has this been removed or is it available under a different name?

Maybe the problem is the existing "rescale" function in Matlab (Introduced in R2017b), we have two functions with the same name. Once FitOpt.Scaling is specified, the esfit fails because the original Matlab function "rescale" does not recognize this parameter. There is a need to rename the EasySpin rescale function and include this change into esfit.

This is an unfortunate consequence of the fact that all functions in MATLAB live in the same namespace.

The workaround is to make sure the EasySpin path comes first in your MATLAB path, so the other rescale function is shadowed and won't be called by esfit.

Many thanks for your message. Do you mean to put easyspin first in the list of paths (Set Path window)? I tried that but this doesn't seem to solve the problem.

Yes, that's how it should work. Save the Path to make sure changes persist across sessions.

What do you get if you type which -all rescale in the Command Window? It should show something like

C:\easyspin\easyspin\rescale.m
C:\Program Files\MATLAB\R2020b\toolbox\matlab\datafun\rescale.m        % Shadowed

This shows that MATLAB's rescale function is shadowed, and that EasySpins's rescale is called.

I just ran

which -all rescale

and I got the following:

C:\EasySpin\easyspin-5.2.30\easyspin\rescale.p
C:\Program Files\MATLAB\R2020b\toolbox\matlab\bigdata\@tall\rescale.m            % tall method
C:\Program Files\MATLAB\R2020b\toolbox\parallel\parallel\@distributed\rescale.m  % distributed method
C:\EasySpin\easyspin-5.2.30\easyspin\rescale.m                               % Shadowed
C:\Program Files\MATLAB\R2020b\toolbox\matlab\datafun\rescale.m                  % Shadowed

I put easyspin in the first line in my list of paths, but Matlab nonetheless prefers those two tall and distributed methods over the easyspin rescale.m one. One workaround would be to remove these two toolboxes, but is there a different possible fix?

Hello,
I get the same error and even removing the toolboxes does not seem to work.

Hello

I have the same problem as michs. I get the exact same output with the command

$ which -all rescale

Also, putting EasySpin first in my path does not solve the problem. I'm running Matlab R2019b on Ubuntu 18.4 if that is important.