How to specify the size of the test problem?

[Xiaoyi-Qu]

I'm wondering how to set the problem dimension for some of the CUTEst problems. For instance, test problem CHAIN has the following options:

Parameters available for problem CHAIN:
NH = 50 (int) 
NH = 100 (int) 
NH = 200 (int) 
NH = 400 (int) [default]
End of parameters for problem CHAIN

I have access to the default option by calling nlp = CUTEstModel("CHAIN"). For the time being, I can access to the other options by modifying the CHAIN.sif file. My question is if there is a smarter way to work around this.

[abelsiqueira]

Hi @Xiaoyi-Qu, thanks for creating the issue. This is not well documented, but you can use

CUTEstModel("CHAIN", "-param", "NH=50")

to change parameters.
I will improve the documentation a bit on this.

[Xiaoyi-Qu]

Thank you very much!