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## Bat algorithm (demo)

version 1.0.0.0 (2.9 KB) by Xin-She Yang

### Xin-She Yang (view profile)

This is a demo for Bat Algorithm, developed by Xin-She Yang (2010).

Updated 20 Jul 2012

This is a short demo for the popular, nature-inspired/metaheuristic,
bat algorithm (BA), which can deal with nonlinear, global optimization problems.
Bat algorithm has the advantages of simplicity, flexility and stability.
It can also automatically switch from global exploration to
local exploitation by fine-tuning its parameters: A and r.

http://arxiv.org/abs/1004.4170

djim djim

### djim djim (view profile)

hello,
The BAT algorithm Source Code , do not converge for any benchMark function!!

djim djim

wenbin Leon

jianlu hu

Mohamed Kamel

Abhishek Gupta

### Abhishek Gupta (view profile)

The complete implementation of BAT algorithm is available at https://in.mathworks.com/matlabcentral/fileexchange/68981-bat-optimization-algorithm

SAID ZAKARIA SAID

### SAID ZAKARIA SAID (view profile)

Hello Prof Xin-She Yang
How to hybridize BAT algorithm with Moth-Flame Optimization Algorithm if you have them in different scripts.

email: djiddosaid@gmail.com
Thank you so much

dear proffesor,
I am very interested in bat algorithm and decided to use it in my final year project for improvement in global optimazation problems.
can you send the bat algorithm code to me so that i could study it. Thank you.

upendra bajpai

### upendra bajpai (view profile)

please someone explain why we have chosen here dimension d & what it indicates.

Pranay Rayana

### Pranay Rayana (view profile)

hello,
I did not understand this code. Can't we create an environment and view the shortest path like in Probabilistic Road Map (PRM)?
And what does the dimension mean in this code?

mingzhu zhang

### mingzhu zhang (view profile)

if (Fnew<=Fitness(i)) & (rand<A) ,
Sol(i,:)=S(i,:);
Fitness(i)=Fnew
end
Why accept a better solution with a certain probability? And This probability becomes smaller and smaller as the number of iterations increases

wanghu wanghu

### wanghu wanghu (view profile)

Thank you for your share of Dr. Yang.

Yang Li

### Yang Li (view profile)

if (rand < Ai & f(xi) < f(x))
Accept the new solutions
Increase ri and reduce Ai
end if
in the article of Dr. Yang, but the code is different. I need a great code of Matlab . Thank you! 263211434@qq.com

Luis Lopez

jkthink

### jkthink (view profile)

I noticed that problem as well. Your solution seems to work, though it would have been great if Dr. Yang could provide with a formal solution. 835441346@qq.com

Mahima j

### Mahima j (view profile)

I want a solution matlab code modified bat algorithm

asharani belanke

### asharani belanke (view profile)

Hello..can u plz help to write a code for minimize the total cost.actually my Ain is allocation of battery in microgrid.and I am extremely new in MATLAB.

ronit agarwal

### ronit agarwal (view profile)

i want bat algorithm and code for clustering in java.........

Dear Prof

Im a maths student an I have found Bat algorithm to interesting would like so much to know if the Bat Inspired algorithm can be of any use in the fields of Electrical distribution and Transmission.

Email:2016sors@gmail.com

zhen li

### zhen li (view profile)

dear prof
I am very interested in bat algorithm.
can you send the bat algorithm code to me?
e-mail
zhenli_ysu@126.com

thank you

dalia elkashef

### dalia elkashef (view profile)

dear prof

can you help me with chaotic bat algorithm code ??
e-mail
eng.daliaarafa@gmail.com

yi'xing wang

payam baban

Shramana GS

### Shramana GS (view profile)

I Have a Question. Everytime I run this algorithm, I get different sets of solutions every time. Why is it so? Shouldn't there be a unique solution for a given problem? Plz Help.

Sindhuja J

baibhav bishal

karim

### karim (view profile)

Hello
@ Eric : In the article published by Dr. Yang, he did not specify that “epsilon” must be a uniform random number.

Comparing the proposed demo and the pseudo-code presented in the article of Dr. Yang, I noticed this:
In the article: if (rand < Ai & f(xi) < f(x*)) and x* is the current global best location (solution) which is located after comparing all the solutions among all the n bats. But, in the demo,
if (Fnew<=Fitness(i)) & (rand<A),
Sol(i,:)=S(i,:);
Fitness(i)=Fnew;
end
I understand from this that for each bat, we do a comparaison between the new calculated fitness values against the previous one, not against the global best. Then, each bat memorises his "individual" best location and update it according to the condition mentionned above. I hope that i will have clarification about this.

Eric

### Eric (view profile)

There are three discrepancies in this code (compared to the published algorithm)

1. Line 79
Q(i)=Qmin+(Qmin-Qmax)*rand;

should be replaced with
Q(i)=Qmin+(Qmax-Qmin)*rand;

2. Similar to what @Frank said
Line 83
Sol(i,:)=simplebounds(Sol(i,:),Lb,Ub);

should be replaced with
S(i,:)=simplebounds(S(i,:),Lb,Ub);
and moved to Line 89 (*before* %Evaluate Evaluate new solutions)

3. Line 87
S(i,:)=best+0.001*randn(1,d);

The 2010 paper "A New Metaheuristic Bat-Inspired Algorithm" seems to suggest that 0.001 should be the variable "A" and that randn(1,d) should actually be 1-2*rand(1,d)... that is a uniformly distributed random number bounded by [-1,1].

leoc

### leoc (view profile)

@Frank,

I noticed that problem as well. Your solution seems to work, though it would have been great if Dr. Yang could provide with a formal solution.

Amon

### Amon (view profile)

Hello
I have my Objective function and constraint, anyone can help me to guide me on how implement it.
Actually mu purpose is reduce electric distribution loss.

acharab

It is good.

Frank

### Frank (view profile)

Would this line of code in bat_algorithm.m:

% Apply simple bounds/limits
Sol(i,:)=simplebounds(Sol(i,:),Lb,Ub);

be moved to just above the line of
% Evaluate new solutions

and be modified to:
S(i,:)=simplebounds(S(i,:),Lb,Ub);

so that we may not have solutions outside the lower and upper bound?

hui

### hui (view profile)

Easy to understand...

Al Algo

### Al Algo (view profile)

Very easy to understand but works magic.

peng

### peng (view profile)

It is easy to understand, and it works magic. Excellent!

win

### win (view profile)

simple and easy of use.... thanks

sehrish

### sehrish (view profile)

I am interest in your optimization algorithm. May i know is there a 'train' function coded because I would want to use it to train neural network.
Thank you.

sehrish

### sehrish (view profile)

Hi plz anyone can guide how to train Neural Network using Bat algorithm????

d g

### d g (view profile)

also how to get graphs for bat algorithm..?

d g

### d g (view profile)

hey i want to compare cuckoo search and bat algorithm.. can you tell me on what parameters should i compare them..

teroy tman

It is very good.

Q Q

### Q Q (view profile)

It is easy to understand, and it works magic. Excellent!

##### MATLAB Release Compatibility
Created with R14
Compatible with any release
##### Platform Compatibility
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