Evolution and Optimum Seeking

( + ) Evolution Strategy KORR 387
1 No recombination
2 Discrete recombination of pairs of parents
3 Intermediary recombination of pairs of parents
4 Discrete recombination of all parents
5 Intermediary recombination of all parents in pairs
BKORRL (logical) Switch forvariability of the mutation hyperellipsoid
(locus of equal probability density).
BKORRL=.FALSE. The ellipsoid cannot rotate.
BKORRL=.TRUE. The ellipsoid can extend and rotate.
KONVKR (integer) Switch fortheconvergence criterion:
KONVKR = 1 The di erence in the objective functionvalues between
the best and worst parents at the start of each
generation is used to determine whether to terminate
the search before the time limit is reached. It
is assumed that IELTER > 1.
KONVKR > 1 (best 2 N): The change in the mean of all the
parental objective function values in KONVKR generations
is used as the search termination criterion.
In both cases EPSILO(3) serves as the absolute and
EPSILO(4) as the relative bound for deciding to terminate
the search.
IFALLK (integer) Return code with the following meaning:
IFALLK = ;2 Starting point not feasible, search terminated on
nding a minimal value of the auxiliary objective
function without satisfying all the constraints.
IFALLK = ;1 Starting point not feasible, search for a feasible parameter
vector terminated because time limit was
reached.
IFALLK=0 Starting point not feasible, search for a feasible
XSTERN vector successful, search foraminimum
can be restarted with this.
IFALLK=1 Search for a minimum terminated because time limit
was reached.
IFALLK=2 Search for minimum terminated regularly. The convergence
criterion was satis ed.
IFALLK=3 As for IFALLK = 1, but time limit reached not at
the end of a generation but in an attempt to generate
NACHKO viable descendants.
TGRENZ (real) Parameter used in monitoring the computation time,
e.g., the maximum CPU time in seconds. Search
terminated at the latest at the end of the generation
for which TKONTR TGRENZ.