ColgenInstance:set(+What,++Value)

What

Parameter name

Value

Parameter value

Description

Set parameters for the give column generation instance:

disallow (off|lp|clp)

policy for active preventions of duplicate columns.

int_tolerance (1e-5|float)

tolerance for optimality.

basis_perturbation (off|on)

should we try and perturb the external solver basis when we appear to be at optimal and external solver returns same basis after adding columns ('off' - no, 'on' - temporarily set the external solver to always perturb)

info_messages (off|on)

print messages while solving.

on_degeneracy (stop|continue)

should we halt when we find degeneracy (default 'stop'), or continue and let the subproblem solver deal with it ('continue').

stabilisation (off|on()|stab_pred())

the policy to perform basis stabilisation:

off

no stabilisation is performed.

on(BoundIter, BoundUpdate, CoeffIter, CoeffUpdate)

then the default policy is used with var bounds/coefficients updated by BoundUpdate/CoeffUpdate after BoundIter/CoeffIter iterations respectively.

stab_pred(UpdatePred, StoppingPred)

a user defined policy is employed and UpdatePred/ StoppingPred should be predicates that perform the updates and test for stopping conditions.

stab_coeff/bound_minus/plus(Ident)

parameters for stabilisation, per constraint.

See Also