How to find problems with equality constraints only? about pycutest HOT 5 CLOSED

Welcome @Xiaoyi-Qu, sorry we understand your confusion. What in PyCUTEst we currently call problems with only equality constraints correspond to problems whose only constraints are fixed variables, and by default PyCUTEst drops fixed variables when problems are imported (drop_fixed_variables=True).

For example, consider the SSC problem:

>>> prob = pycutest.import_problem('SSC')
>>> prob.n
4900
>>> prob.m
0
>>> prob = pycutest.import_problem('SSC', drop_fixed_variables=False)
>>> prob.n
5184
>>> prob.m
0

@lindonroberts perhaps the name 'equality' is confusing/wrong here and should be 'fixed' instead? Currently we are mapping SIF classification code X "the problem's only constraints are fixed variables" to 'equality'.

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@jfowkes - yes, I hadn't thought about it, but equality is definitely confusing. I like your suggestion of fixed instead.

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Thank you very much for your @jfowkes clarification! If I understand correctly, to find test problems with equality constraints, I need to write a function myself.

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@Xiaoyi-Qu yes that's correct unfortunately we don't currently have a way of finding problems with equality constraints.

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Thanks @lindonroberts, will change it to fixed, should probably also do a new minor release afterwards.

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