Particle swarm optimization (6)-----Several evaluation functions of fitness

Several fitness evaluation functions are given, and the graphical representation is given.

The first few days of the virus, reinstall the system, accidentally the program all formatted, crying!!! No way, a lot of programs are missing, now put these several typical functions rewritten, give them out, even if the particle swarm algorithm is an end! Hate virus!!!!

The first function: The Griewank function, the graph looks like this:

The fitness function is as follows: (for maximum value, I went to the opposite number of all function values)

function　y=Griewank(x)
%Griewan函数
%输入x,给出相应的y值,在x=(0,0,…,0)处有全局极小点0.
%编制人：
%编制日期：
[row,col]=size(x);
if　row>1
　　　　 error('输入的参数错误');
end
y1=1/4000*sum(x.^2);
y2=1;
for　h=1:col
　　　　 y2=y2*cos(x(h)/sqrt(h));
end
y=y1-y2+1;
y=-y;