Documentation of mutswaptyp
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NewChrom = mutswaptyp(Chrom, VLUB, MutOpt)
MUTation by SWAPping variables of identical type
This function takes the individuals of the current
population and mutates each indivdual by swapping variables
of the individual. Only variables of the same type (same
boundaries of domain, for instance, binary, signed and unsigned char,
signed and unsigned integer, and real variables with the same
boundaries) are exchanged/swapped.
Currently, only one exchange per individual takes place (mutation rate fixed
to 1/number of variables).
If mutation is 1/Nvar or larger, every individual is mutated ones.
If mutation rate is > 1/Nvar, additional mutations (swap of
variables) are performed. That means, for some individuals
more than one swap of variables takes place. A mutation rate
of 2/Nvar produces (statistically) 2 swaps of variables per
The mutation range and precision are used for all mutations.
The resulting population is returned.
This mutation operator may be used with every variable
representation, as long as the swap of the variables with identical
boundaries makes any sense. The mutation operator just exchanges/swaps
the variables, no change of the variable value is performed.
Syntax: NewChrom = mutswaptyp(Chrom, VLUB, MutOpt)
Chrom - A matrix containing the chromosomes of the
current population. Each row corresponds to
an individuals string representation.
VLUB - Matrix containing the boundaries of each variable.
not used here, necessary for compatibility with
real valued mutation
MutOpt - (optional) Vector containing mutation options
MutOpt(1): MutRate - number containing the mutation rate -
probability for mutation of a variable
if omitted or NaN, MutRate = 1/variables per
individual is assumed
MutOpt(2): MutRange - (optional) number for shrinking the
mutation range in the range [0 1], possibility to
shrink the range of the mutation depending on,
for instance actual generation.
if omitted or NaN, MutRange = .2 is assumed
MutOpt(3): MutPreci - (optional) precision of mutation steps
if omitted or NaN, MutPreci = 8 is assumed
NewChrom - Matrix containing a mutated version of Chrom.
See also: mutate, mutswap, mutexch, mutreal, mutbin, mutint, initip
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,