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Your definition of your data ('%f %f') is two floating-point columns with one space between them. However, you actual data have three spaces. Maybe first try correcting that. As for zJ, you could easily calculate it by doing the relevant algebra on your calculated curve (e.g. BestSpc) once the calcu...

And just a final (I think) question:

From what I understand, at the moment curry cannot calculate multi-component systems like pepper can (e.g. an antiferromagnetic system and its paramagnetic impurity).

Is there a way to do so, or is that planned for a next version?

I am trying to better understand how to create custom simulation functions to invoke with esfit. So far, I have understood that we can use custom functions to tie together parameters defined in Sys (e.g. J couplings, or hyperfine couplings) and to fit experimental parameters defined in Exp, such as ...

OK, got it: I needed to invoke my custom function with FitOpt.OutArg = [2 2]; so that I would still get chi, and then in my custom function do a bit of flip-flopping the y array to multiply it with T and then bring it back to its [1 x n] form: function [x,y] = constrainJg_isosceles_xT(Sys1,Exp,Opt);...

I have only used it in an either/or scenario (graphical output / ascii file), but I don't know if that's the only way.

Maybe try: Does that work?

Thanks for the suggestion. I have tried some variations of your suggestion and I get different errors (I always invoke my function with FitOpt.OutArg = [2 1]; ) 1. My first try is function [x,y] = constrainJg_isosceles_xT(Sys1,Exp,Opt); fullSys = etc... T = 0; [x,y] = curry(fullSys,Exp,Opt); x = x.*...

Thanks for pointing this out!
Using: and invoking levelsplot as did the trick.

The different behaviour between the two Matlab versions gave me the false impression it was a bug.

Assuming I have correctly understood how to do that, I tried changing the custom function to: function [x,y] = constrainJg_isosceles_xT(Sys1,Exp,Opt); fullSys = Sys1; fullSys.g = [Sys1.g]; fullSys.ee = [Sys1.Ja Sys1.Ja Sys1.Jb]; chiSI = 0; T = 0; chiSIT = chiSI.*T; x = chiSIT; [x,y] = curry(fullSys,...

When using levelsplot with ES 5.0.20 I get two different behaviours depending on the version of Matlab I use, for the same piece of code: I invoke levelsplot in a rather straightforward manner: I previously define my Sys structure and the experimental details (among which the orientation cori and fr...