Contype in API

[TD]

Hi there

In the oldAPI (10.x and earlier), it is clearly shown how the array cType can be used to describe the type of constraints of the constraint function. This used to be done in KTR_init_problem().

Is this still possible in the latest API? (And if so, how would this now be done?)

Kind regards

TD

[Richard Waltz]

Hi,

In the current API, the cType array is no longer used -- rather, the constraint type is automatically determined based on the API functions used to specify the constraint.  For example, linear constraints should be loaded using the API function "KN_add_con_linear_struct()"

https://www.artelys.com/docs/knitro//3_referenceManual/callableLibraryAPI.html?highlight=kn_add_con_linear_struct#KN_add_con_linear_struct

Quadratic constraints should be loaded using the function above to load the linear terms and "KN_add_con_quadratic_struct()" for the quadratic terms:

https://www.artelys.com/docs/knitro//3_referenceManual/callableLibraryAPI.html?highlight=kn_add_con_quadratic_struct#KN_add_con_quadratic_struct

General, nonlinear (beyond quadratic) constraints/structures should be handled through a callback function in the same way as the 10.x and earlier old API.  Anything specified through a callback is automatically treated as general nonlinear so it is always best to use the specified API functions for loading linear and quadratic structures in your model so that Knitro can be aware of, and exploit these special structures whenever possible.

Kind regards,

-Richard

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From: kni...@googlegroups.com <kni...@googlegroups.com> on behalf of TD <tinusd...@gmail.com>
Sent: Monday, July 3, 2023 7:47 AM
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Subject: [Knitro] Contype in API

 

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[TD]

Thanks, Richard!