📄 pso程序的源代码-粒子群优化算法基本程序[转]_dying in the sun.htm
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<DIV class=tit>pso程序的源代码-粒子群优化算法基本程序[转]</DIV>
<DIV class=date>2006-12-01 09:28</DIV>
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<H2
class=diaryTitle>pso程序的源代码 </H2>
<P> pso程序的源代码-粒子群优化算法源程序</P>
<P align=left>作者：FashionXu</P>
<P align=left>一个pso程序的源代码。在vc.net2003下面通过。</P>
<P
align=left>建议：看代码之前，请先弄明白pso是怎么回事。然后请对应着来：程序中用Agent代表一只鸟，PSO代表鸟群。阅读源代码，不要顺着看，先看main(),然后按照出现的东西的顺序，一个一个得来，呵呵，纯粹是建议。</P>
<P
align=left>// PSO.cpp : 定义控制台应用程序的入口点。<BR>//粒子群优化算法基本程序<BR>//你可以使用本代码，如果感到对你有用的话，请通知作者，作者会很高兴。<BR>//通讯地址：fashionxu@163.com<BR>//by FashionXu</P>
<P
align=left>//本程序在vc++.net 2003下面通过，你如果要在vc6.0下面使用，请查阅相关资料修改，或者联系作者<BR>#include "stdafx.h"<BR>#include "iostream"<BR>#define _USE_MATH_DEFINES<BR>#include "math.h"<BR>#include <TIME.H></TIME.H></P>
<P
align=left>const int iAgentDim=20;//优化函数的维数<BR>const double iRangL=-30;//函数的取值范围<BR>const double iRangR=30;</P>
<P align=left>const int iPSONum=20;//粒子数</P>
<P
align=left>int iStep=10000;//跌代次数<BR>//下面的值，要具体程序中具体的修改，根据你优化的函数来修改<BR>double w=0.9;//惯性系数<BR>const double delta1=1;//1.494;//加速度<BR>const double delta2=1;//1.494;</P>
<P
align=left>#define rnd(low,uper)((rand()/(double)RAND_MAX)*((uper)-(low))+(low))//这个东西，返回low ,uper之间的一个值<BR>double gbest[iAgentDim];//global best fitness保留全局最优值的坐标<BR>using namespace std;</P>
<P align=left> </P>
<P
align=left>class Agent//这个类表示单个的粒子，也就是一只鸟 ：）<BR>{<BR>public:<BR> double dpos[iAgentDim]; //位置，也就是各个维数的值<BR> double dpbest[iAgentDim]; //维护一个“自己”找到的最优值的解<BR> double dv[iAgentDim]; //速度<BR> double m_dFitness;//agent's fitness 当前算出的一个值<BR> double m_dBestfitness;//agent's best fitness 自己已经找到的最好值</P>
<P
align=left> Agent()//初始化<BR> { <BR> srand( (unsigned)(time( NULL )+rand()) );<BR> int i=0;<BR> for(;i {<BR> dpos[i]=rnd(iRangL,iRangR);<BR> dv[i]=dpbest[i]=dpos[i];<BR> }<BR> }<BR> void UpdateFitness()<BR> /*calculate the fitness and find out the best fitness,record*/<BR> {<BR> <BR> double sum1=0;<BR> double sum2=0;</P>
<P align=left>/*Ackley Funtion*/ </P>
<P
align=left> for (int i=0;i<IAGENTDIM></IAGENTDIM> {<BR> sum1+=(dpos [i]*dpos [i]);<BR> sum2+=cos(2*M_PI*dpos [i]);<BR> }</P>
<P
align=left> m_dFitness=(-20*exp(-0.2*(sqrt((1.0/(double)iAgentDim *sum1))))-exp((1.0/(double)iAgentDim )*sum2)+20+M_E);<BR> //The Rastrigin function<BR> //int i=0;<BR> //for (;i //{<BR> // sum1+=(dpos [i]*dpos [i])-3.0*cos(2*M_PI*dpos [i]);<BR> //}<BR> //m_dFitness=3.0*iAgentDim+sum1;</P>
<P
align=left> //找到一个更好的值后，更新 m_dBestfitness<BR> if (m_dFitness {<BR> m_dBestfitness=m_dFitness;<BR> int i=0;<BR> for(;i {<BR> dpbest[i]=dpos[i];<BR> }<BR> }<BR> <BR> }<BR> void UpdatePos()//agent moving<BR> {<BR> int i=0;</P>
<P align=left> for(;i {</P>
<P
align=left>// basi pso<BR> dv[i]=w*dv[i]+delta1*rnd(0,1)*(dpbest[i]-dpos[i])+delta2*rnd(0,1)*(gbest[i]-dpos[i]);<BR> dpos[i]+=dv[i];<BR> }</P>
<P
align=left> }<BR>};<BR>class PSO//这是粒子群，也就是鸟群了<BR>{<BR>private:<BR> Agent agents[iPSONum];<BR> double m_dBestFitness;//鸟群找到的最优值<BR> int m_iTempPos;<BR>public:<BR> void Init();<BR> void Search();<BR>};<BR>void PSO::Search()<BR>{<BR> int k=0; </P>
<P
align=left> while( k {<BR> m_iTempPos=999;<BR> int i;<BR> for(i=0;i {//此处是找找鸟群中有没有更好的解，如果有，记录下来<BR> if (m_dBestFitness>agents[i].m_dBestfitness ) <BR> {<BR> m_dBestFitness=agents[i].m_dBestfitness;<BR> m_iTempPos=i;//找到到的最好解的位置<BR> }<BR> }<BR> if (m_iTempPos!=999)<BR> {<BR> int j;</P>
<P
align=left> for(j=0;j {<BR> gbest[j]=agents[m_iTempPos].dpos[j];//记录全局最优解的各个坐标<BR> }<BR> }<BR> //printf("The best is %f \n",m_dBestFitness);<BR> //下一次跌代<BR> for(i=0;i { <BR> agents[i].UpdatePos();<BR> agents[i].UpdateFitness ();<BR> } <BR> k++;</P>
<P
align=left> }<BR> printf("The best result is: %2.15f after %d step. \n",m_dBestFitness,k);</P>
<P
align=left> {<BR> for (int i=0;i printf(" %2.15f ",gbest[i]);<BR> }<BR> }</P>
<P
align=left>void PSO::Init()//初始化，<BR>{<BR> int i=0;<BR> m_dBestFitness=100000;<BR> srand( (unsigned)(time( NULL )+rand()) ); <BR> for(;i { <BR> agents[i].m_dBestfitness =100000;//将m_dBestfitness赋值为一个大的值，目的是找最小值，<BR> agents[i].UpdateFitness();<BR> }<BR>}<BR>int main(int argc, char* argv[])<BR>{<BR> PSO pso;<BR> pso.Init ();<BR> pso.Search();<BR> printf("\n");<BR> char c;<BR> scanf("%c",&c);<BR> return 0;<BR>}<BR></P></DIV></TD></TR></TBODY></TABLE><BR>
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