Maximizing a Function
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MD NASAR
le 21 Avr 2012
Réponse apportée : mhy
le 13 Mar 2019
Dear all
maximizing f(x) = x2 using genetic algorithm,
where x ranges from 0 to 31. Perform 4 iterations. i got his code form one site. code is
%program for Genetic algorithm to maximize the function f(x) =sin(x)
clear all;
clc;
%x ranges from 0 to 3.14
%five bits are enough to represent x in binary representation
n=input('Enter no. of population in each iteration');
nit=input('Enter no. of iterations');
%Generate the initial population
[oldchrom]=initbp(n,5);
%The population in binary is converted to integer
FieldD=[5;0;3.14;0;0;1;1]
for i=1:nit
phen=bindecod(oldchrom,FieldD,3);% phen gives the integer value of the
%binary population
%obtain fitness value
FitnV=sin(phen);
%apply roulette wheel selection
Nsel=4;
newchrix=selrws(FitnV, Nsel);
newchrom=oldchrom(newchrix,:);
%Perform Crossover
crossoverrate=1;
newchromc=recsp(newchrom,crossoverrate);%new population after crossover
%Perform mutation
vlub=0:31;
mutationrate=0.001;
newchromm=mutrandbin(newchromc,vlub,mutationrate);%new population
%after mutation
disp('For iteration');
i
disp('Population');
oldchrom
disp('X');
phen
disp('f(X)');
FitnV
oldchrom=newchromm;
end
when i am ruining this it gave error
??? Undefined function or method 'initbp' for input arguments of type 'double'.
Error in ==> bookcode at 9
[oldchrom]=initbp(n,5);
please some one give me solution
Thank you.
4 commentaires
sivakumar c
le 11 Juil 2016
Not only initbp undefined function.In this coding have four undefined function(initbp,bindecod,selrws,recsp).we should implement these funtion code for above coding.
Walter Roberson
le 11 Juil 2016
Réponse acceptée
Walter Roberson
le 22 Avr 2012
initbp() is not a Mathworks-provided function, and it is also not part of any MATLAB File Exchange contribution.
Plus de réponses (3)
Jan
le 22 Avr 2012
While your code is not readable without formatting (see the "Markup help" link!), the error message seem to be clear: The function "initbp" is not known. Do you expect this function to exist? It is not in the current Matlab path, so perhaps you forgot to add a specific folder?
0 commentaires
mado
le 11 Avr 2013
Is this function [oldchrom]=initbp(n,5); not existed in higher matlab version
1 commentaire
mhy
le 13 Mar 2019
First,I’m sorry to bother you. It seems that you have the geatbx toolbox. I wonder where you get it, or could you please send one to me? I'm so appreciate for it. Thank you so much. My Email: 1449011027@qq.com
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