# Maximizing a Function

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MD NASAR am 21 Apr. 2012
Beantwortet: mhy am 13 Mär. 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.
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sivakumar c am 11 Jul. 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 am 11 Jul. 2016
It appears that the missing functions might be part of the third-party geatbx toolbox

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### Akzeptierte Antwort

Walter Roberson am 22 Apr. 2012
initbp() is not a Mathworks-provided function, and it is also not part of any MATLAB File Exchange contribution.
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MD NASAR am 24 Apr. 2012
Thank you sir.
any alternative function in matlab

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### Weitere Antworten (3)

Jan am 22 Apr. 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?
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Is this function [oldchrom]=initbp(n,5); not existed in higher matlab version
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Jan am 11 Apr. 2013
"Higher" than which version do you mean?

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mhy am 13 Mär. 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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