Stationary equation and Co-state in optimal control

[JEEVAN KANESAN]

Dear all,

I am looking out how to obtain the stationary equation(DH/du) results from APM-matlab optimal control.

 To obtain the co-state (Langrage multiplier), we have used : 

apm_get(s,a,'apm_lam.txt')

However, the results seems in a single line, hence not able to distinguish which co-state its referring to. Above all,  the results for co-state does not make sense when compared with co-state obtained from AMPL solver or pure Matlab solver despite the state variable are all accurate. Is there a way here?

Regards,

Jeevan

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[John Hedengren]

Jeevan,

 

The difference is likely because of the problem formulation with orthogonal collocation on finite elements. There is additional information on how the problem is translated from Differential Algebraic Equations to a Algebraic Equations here: https://apmonitor.com/do/index.php/Main/OrthogonalCollocation  Please consider posting a simplified version of the problem with source code examples to Stack Overflow: https://stackoverflow.com/questions/tagged/gekko

 

Best regards,

John Hedengren

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