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I used the CONOPT solver for calculating nlp, but the results showed that the marginal of the equationsis either 0 or EPS.Someone told me that CONOPT does not provide marginal values ,so what should I do to obtain the marginal of equality/inequality constraints?
Besides,I used the IPOPT solver, which can obtain the marginal values of equations and variables, but this result is not optimistic when used throughout the entire system.

Conopt delivers fine marginals. Nothing wrong with 0 or EPS marginals. If you want more detailed information, you might want to share your model.

-Michael