# Maximizing a Function

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MD NASAR 2012년 4월 21일
답변: mhy 2019년 3월 13일
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.
##### 댓글 수: 4표시숨기기 이전 댓글 수: 3
Walter Roberson 2016년 7월 11일
It appears that the missing functions might be part of the third-party geatbx toolbox

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### 채택된 답변

Walter Roberson 2012년 4월 22일
initbp() is not a Mathworks-provided function, and it is also not part of any MATLAB File Exchange contribution.
Perhaps you need to download a third-party toolbox, such as http://www.geatbx.com/docu/initbp.html
##### 댓글 수: 1표시숨기기 없음
MD NASAR 2012년 4월 24일
Thank you sir.
any alternative function in matlab

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### 추가 답변(3개)

Jan 2012년 4월 22일
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?
##### 댓글 수: 0표시숨기기 이전 댓글 수: -1

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mado 2013년 4월 11일
Is this function [oldchrom]=initbp(n,5); not existed in higher matlab version
##### 댓글 수: 1표시숨기기 없음
Jan 2013년 4월 11일
"Higher" than which version do you mean?

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mhy 2019년 3월 13일
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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