#21 (matcont7p5) Dot indexing error (empty sdata) upon init_LC_LC by the GUI

[Maurizio De Pitta']

Dear Hil,

I recently downloaded Matcont version 7p5 and noticed several updates, including the addition of "Period" as a mandatory parameter for continuing limit cycles (LCs) from Hopf bifurcations.

However, I encountered an issue that might be a bug or perhaps something I'm misunderstanding. The error can also be reproduced by uncommenting >L21 in testadapt1.m, as mentioned in this old forum post:
https://sourceforge.net/p/matcont/discussion/762214/thread/922c06b855/?limit=25#3848.

Specifically, when I select a Hopf point and invoke init_LC_LC through the GUI, I get the error:
Dot indexing is not supported for variables of this type.

After some backtracing, I pinpointed the issue to:

• L63 in init_LC_LC
• L45 in ContConf_LC_LC
• L42-43 in the same ContConf_LC_LC

It appears the variable s is being lost or passed as empty when retrieved via IP.currentpointdata, which seems unusual.

While I could build the continuation manually via the command line, I prefer using the GUI at this stage for training purposes in the lab. For reference, I’ve attached the model file, session.mat file, and the computed curves.

Could you kindly look into this and help resolve the issue?

Thank you!

Cheers,
M