Documentation of seltrunc
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NewChromIx = seltrunc(FitnV, Nsel, Dummy);
SELection by TRUNCation
This function performs SELection by TRUNCation.
Syntax: NewChromIx = seltrunc(FitnV, Nsel)
FitnV - Column vector containing the fitness values of the
individuals in the population.
Nsel - Number of individuals to be selected
NewChromIx- Column vector containing the indexes of the selected
individuals relative to the original population, shuffeld.
The new population, ready for mating, can be obtained
by calculating OldChrom(NewChromIx,:).
For the truncation threshold the inverse of the selection
pressure is used (Trunc = 1/SP).
1/SP is computed from FitnV by mean(FitnV)/max(FitnV)
See also: selection, selsus, selrws, seltour, sellocal
% define fitness vector
FitnV = [.1; .9; 1.6; 2.0; 0.4; 1.3; 1.7; 0.7; 0.2];
% selects 6 indices from FitnV, Trunc = 0.5;
NewChromIx = seltrunc(FitnV, 6);
% possible result
NewChromIx = [3; 4; 2; 4; 6; 7];
% Get selected individuals from population Chrom
SelChrom = Chrom(NewChromIx, :)
This document is part of version 3.8
GEATbx: Genetic and Evolutionary Algorithm Toolbox for use with Matlab -
The Genetic and Evolutionary Algorithm Toolbox is not public domain
© 1994-2006 Hartmut Pohlheim, All Rights Reserved,