Documentation of objridge
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Function Synopsis
ObjVal = objridge(Chrom, P1, P2)
Help text
OBJective function RIDGE
This function implements the coninuous and discrete variant of the
Ridge function. The global minimum is a narrow ridge along the axis
of the first variable.
This function was defined as stepfun5 function in:
Jain, Clusterbasierte Abbruchkriterien fuer den Evolutionaeren Test.
Diploma-thesis, Technical University of Berlin, Department of
Computer Science, chapter 5.1, 1999.
in order to investigate the behaviour of clusterbased termination
criteria in narrow ridges.
Syntax: ObjVal = objridge(Chrom, P1, P2)
Input parameters:
Chrom - Matrix containing the chromosomes of the current
population. Each row corresponds to one individual's
string representation.
If Chrom == [NaN xxx] or
Chrom == [NaN xxx yyy],
then special values will be returned, see Output parameters
xxx == 1 (or []) return boundaries
xxx == 2 return title
yyy == 0 return title of continuous variant
yyy == 1 return title of discrete variant
xxx == 3 return value of global minimum
P1 - (Optional) Number indicating which variant is used,
if Chrom is not NaN or [].
P1 = 1 use discrete version
P1 = 0 use continuous version
If P1 is omitted or P1 = [] the discrete version
is used (P1 = 1).
P2 - Additional parameter
Output parameters:
ObjVal - Column vector containing the objective values of the
individuals in the current population.
if called with
Chrom == [NaN xxx] or Chrom == [NaN xxx yyy],
then ObjVal contains
xxx == 1 (or []), matrix with the boundaries of
the varaibles
xxx == 2, text with the title of the function
yyy omitted: title of continuous variant
yyy = 0 title of continuous variant
yyy = 1 title of discrete variant
xxx == 3, value of global minimum
Examples:
% continuous variant of the Four-Wings function
>> objridge(Chrom)
% discrete variant of the Four-Wings function
>> objridge(Chrom, 1)
Cross-Reference Information
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This function is called by |
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This document is part of
version 3.8 of the
GEATbx: Genetic and Evolutionary Algorithm Toolbox for use with Matlab -
www.geatbx.com.
The Genetic and Evolutionary Algorithm Toolbox is
not public domain.
© 1994-2006 Hartmut Pohlheim, All Rights Reserved,
(support@geatbx.com).