IPOPTLink`

IPOPTReturnCode

IPOPTReturnCode[data] gives the IPOPT solver return code from an IPOPTData expression data.

Details and Options

To use IPOPTReturnCode, you first need to load it using Needs["IPOPTLink`"].
IPOPTReturnCode is used on an IPOPTData expression created by IPOPTMinimize.
The following codes may be returned by the IPOPT solver, with short descriptions from the IPOPT documentation:

	0	Optimal solution found
	1	Solved to acceptable level
	2	Converged to a point of local infeasibility. Problem may be infeasible
	3	Search direction is becoming too small
	4	Iterates diverging; problem might be unbounded
	5	Stopping optimization at current point as requested by user
	6	Feasible point for square problem found
	-1	Maximum number of iterations exceeded
	-2	Restoration failed
	-3	Error in step computation (regularization becomes too large?)
	-4	Maximum CPU time exceeded
	-10	Problem has too few degrees of freedom
	-11	Invalid problem definition
	-12	Invalid option
	-13	Invalid number detected
	-100	Unrecoverable exception
	-101	Unknown exception caught in Ipopt
	-102	Not enough memory
	-199	Internal IPOPT error: unknown SolverReturn value

First, load the package:

Solve a minimization problem using IPOPTMinimize:

Extract the return code:

Load the package:

Solve a minimization problem where an overflow happens and $Failed is returned by default.

Return a solution object so that we can extract the error code, and turn off the messages:

Extract the return code:

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