Error using NLOPT and the AMPL interface

[Walton P. Coutinho]

Hi,

I am running into the error message below whenever I try to solve the attached 

AMPL model using NLOPT (calling GN_ISRES).

solveProb is my matlab wrapper function for calling different solvers.

>> [x,fval,exitflag,info] = solveProb('dubins.mod', 'NLOPT');

------------------------------------------------------------------

 This is NLOPT v2.4.2

 Author: Steven G. Johnson

 Algorithm: ISRES evolutionary constrained optimization (global, no-derivative)

 Problem Properties:

 # Decision Variables:      395

 # Inequality Constraints:  596

 # Equality Constraints:      0

------------------------------------------------------------------

 *** ERROR: Invalid Arguments ***

------------------------------------------------------------------

The problem is that I can't figure out what are the invalid arguments.

[Jonathan Currie]

Hi,

Can you please supply the .nl version of your AMPL model, I no longer have access to the full version of AMPL.

This can be achieved by calling:

>> amplConvert('dubins.mod')

And sending the resulting .nl.

Jonathan

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[Walton P. Coutinho]

Dear Jonathan,

Please find the .nl file attached.

Best,

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[Jonathan Currie]

Hi,

I can only guess that your chosen NLOPT algorithm (GN_ISRES) does not like infinite bounds, as your problem has. Changing these to finite seems to allow it to run.

In addition, NLOPT algorithm LN_COBYLA is my favourite and seems to do quite well with your problem.

Jonathan

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