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4  The DUNDEE structure

Information stored in the structure Prob.DUNDEE
Field	Description
callback	If 1, use a callback to Matlab to compute QP.F x in BQPD and miqpBB . Faster when F is large and nearly dense. Avoids copying the matrix to the MEX solvers.
kmax	Maximum dimension of the reduced space (k ), default equal to dimension of problem. Set to 0 if solving an LP problem.
mlp	Maximum number of levels of recursion.
mode	Mode of operation, default set as 2 * Prob.WarmStart.
x	Solution (warmstart).
k	Dimension of reduced space (warmstart).
e	Steepest-edge normalization coefficient (warmstart).
ls	Indices of active constraints, first n−k. (warmstart).
lp	List of pointers to recursion information in ls (warmstart).
peq	Pointer to end of equality constraint indices in ls (warmstart).
PrintFile	Name of print file. Amount/print type is determined by Prob.DUNDEE.optPar(1) .
optPar	Vector with optimization parameters. Described in Table 4.

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Prob.DUNDEE.optPar values used by TOMLAB /MINLP solvers . −999 in any element gives default value.

				Used by:
Index	Name	Default	Description	BQPD	miqpBB	filterSQP	minlpBB
1	iprint	0	Print level in DUNDEE solvers.	O	O	O	O
2	tol	10−10	Relative accuracy in BQPD solution.	O	O	O	O
3	emin	1	1/0: Use/do not use constraint scaling in BQPD	O	O	O	O
4	sgnf	5 10−4	Maximum relative error in two numbers equal in exact arithmetic.	O	O	O	O
5	nrep	2	Maximum number of refinement steps.	O	O	O	O
6	npiv	3	No repeat of more than npiv steps were taken.	O	O	O	O
7	nres	2	Maximum number of restarts if unsuccessful.	O	O	O	O
8	nfreq	500	Maximum interval between refactorizations.	O	O	O	O
9	ubd	100	Constraint violation parameter I	-	-	O	O
10	tt	0.125	Constraint violation parameter II	-	-	O	O
11	NLP_eps	10−6	Relative tolerance for NLP solutions	-	-	O	O
12	epsilon	10−6	Accuracy for x tests	O	O	O	O
13	MIopttol	10−4	Accuracy for f tests	-	O	-	O
14	fIP	1020	Upper bound on the IP value wanted.	-	O	-	O
15	timing	0	1/0: Use/do not use timing	-	O	-	-
16	max_time	4000	Maximum time (sec's) allowed for the run	-	O	-	-
17	branchtype	1	Branching strategy (1,2,3)	-	O	-	-
18	ifsFirst	0	Exit when first IP solution is found	-	O	-	-
19	infty	1020	Large value used to represent infinity	O	O	O	O
20	Nonlin	0	Treat all constraints as nonlinear if 1	-	-	O	O

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