📄 蚁群算法 c语言程序（已运行）_元朋2007.mht
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<DIV class=3Ddate>2008-04-19 21:10</DIV>
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<P class=3DMsoNormal style=3D"MARGIN: 0cm 0cm 0pt"><SPAN=20
style=3D"mso-bidi-font-size: 10.5pt"><FONT=20
face=3D"Times New Roman">//</FONT></SPAN><SPAN=20
style=3D"mso-hansi-: =
10.5pt">=B6=CE=BA=A3=B1=F5=BD=CC=CA=DA=D6=F7=B1=E0=B5=C4=A1=B6=D2=CF=C8=BA=
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style=3D"mso-bidi-font-size: 10.5pt"><FONT face=3D"Times New =
Roman">.=20
=B2=A2=D3=D0=BC=B8=CE=BB=CD=F8=D3=D1=D0=DE=B8=C4=A1=A3<BR>//Basic =
Ant Colony Algorithm for TSP <BR>#include=20
<iostream.h> <BR>#include <fstream.h> <BR>#include=20
<math.h> <BR>#include <time.h> <BR>#include =
<conio.h>=20
<BR>#include <stdlib.h> <BR>#include <iomanip.h>=20
<BR><BR>#define N 31 //city size <BR>#define M 31 //ant number=20
<BR><BR>double inittao=3D1; <BR>double tao[N][N]; <BR>double =
detatao[N][N];=20
<BR>double distance[N][N]; <BR>double yita[N][N]; <BR>int =
tabu[M][N];=20
<BR>int route[M][N]; <BR>double solution[M]; <BR>int BestRoute[N]; =
<BR>double BestSolution=3D10000000000; <BR>double alfa,beta,rou,Q; =
<BR>int=20
NcMax; <BR>void initparameter(void); // initialize the parameters =
of basic=20
ACA <BR>double EvalueSolution(int *a); // evaluate the solution of =
TSP,=20
and calculate the length of path <BR>void InCityXY( double x[], =
double=20
y[], char *infile ); // input the nodes' coordinates of TSP =
<BR><BR>void=20
initparameter(void) <BR>{ <BR><SPAN style=3D"COLOR: red">alfa=3D1; =
beta=3D5;=20
rou=3D0.9; Q=3D100; </SPAN><BR>NcMax=3D200; <BR>} <BR><BR>void =
main(void) <BR>{=20
<BR>int NC=3D0; <BR>initparameter(); <BR>double x[N]; <BR>double =
y[N];=20
<BR>InCityXY( x, y, "city31.tsp" ); <BR><BR>for(int =
i=3D0;i<N;i++)=20
<BR>for(int j=3Di+1;j<N;j++) <BR>{=20
=
<BR>distance[j][i]=3Dsqrt((x[i]-x[j])*(x[i]-x[j])+(y[i]-y[j])*(y[i]-y[j])=
);=20
<BR>distance[i][j]=3Ddistance[j][i]; <BR>} <BR>// calculate the =
heuristic=20
parameters <BR>for(i=3D0;i<N;i++) <BR>for(int j=3D0;j<N;j++) =
<BR>{=20
<BR>tao[i][j]=3Dinittao; <BR>if(j!=3Di) =
<BR>yita[i][j]=3D100/distance[i][j];=20
<BR>} <BR>for(int k=3D0;k<M;k++) <BR>for(i=3D0;i<N;i++)=20
<BR>route[k][i]=3D-1; <BR>srand(time(NULL)); =
<BR>for(k=3D0;k<M;k++) <BR>{=20
<BR>route[k][0]=3Dk%N; <BR>tabu[k][route[k][0]]=3D1; <BR>} =
<BR>//each ant try=20
to find the optiamal path <BR>do { <BR>int s=3D1; <BR>double =
partsum;=20
<BR>double pper; <BR>double drand; <BR>//ant choose one whole path =
<BR>while(s<N) <BR>{ <BR>for(k=3D0;k<M;k++) <BR>{ <BR>int=20
jrand=3Drand()%3000; <BR>drand=3Djrand/3001.; <BR>partsum=3D0; =
<BR>pper=3D0;=20
<BR>for(int j=3D0;j<N;j++) <BR>{ <BR>if(tabu[k][j]=3D=3D0)=20
=
<BR>partsum+=3Dpow(tao[route[k][s-1]][j],alfa)*pow(yita[route[k][s-1]][j]=
,beta);=20
<BR>} <BR>for(j=3D0;j<N;j++) <BR>{ <BR>if(tabu[k][j]=3D=3D0)=20
=
<BR>pper+=3Dpow(tao[route[k][s-1]][j],alfa)*pow(yita[route[k][s-1]][j],be=
ta)/partsum;=20
<BR>if(pper>drand) <BR>break; <BR>} <BR>tabu[k][j]=3D1;=20
<BR>route[k][s]=3Dj; <BR>} <BR>s++; <BR>} <BR>// the pheromone is =
updated=20
<BR>for(i=3D0;i<N;i++) <BR>for(int j=3D0;j<N;j++) =
<BR>detatao[i][j]=3D0;=20
<BR>for(k=3D0;k<M;k++) <BR>{ =
<BR>solution[k]=3DEvalueSolution(route[k]);=20
<BR>if(solution[k]<BestSolution) <BR>{ =
<BR>BestSolution=3Dsolution[k];=20
<BR>for(s=3D0;s<N;s++) <BR>BestRoute[s]=3Droute[k][s]; <BR>} =
<BR>}=20
<BR>for(k=3D0;k<M;k++) <BR>{ <BR>for(s=3D0;s<N-1;s++)=20
<BR>detatao[route[k][s]][route[k][s+1]]+=3DQ/solution[k];=20
<BR>detatao[route[k][N-1]][route[k][0]]+=3DQ/solution[k]; <BR>}=20
<BR>for(i=3D0;i<N;i++) <BR>for(int j=3D0;j<N;j++) <BR>{=20
<BR>tao[i][j]=3Drou*tao[i][j]+detatao[i][j]; =
<BR>if(tao[i][j]<0.00001)=20
<BR>tao[i][j]=3D0.00001; <BR>if(tao[i][j]>20) =
<BR>tao[i][j]=3D20; <BR>}=20
<BR>for(k=3D0;k<M;k++) <BR>for(int j=3D1;j<N;j++) <BR>{=20
<BR>tabu[k][route[k][j]]=3D0; <BR>route[k][j]=3D-1; <BR>} =
<BR>NC++; <BR>}=20
while(NC<NcMax); <BR>//output the calculating results =
<BR>fstream=20
result; <BR>result.open("optimal_results.log", ios::app); =
<BR>if(!result)=20
<BR>{ <BR>cout<<"can't open the <optimal_results.log>=20
file!\n"; <BR>exit(0); <BR>}=20
=
<BR>result<<"*-----------------------------------------------------=
--------------------*"<<endl;=20
<BR>result<<"the initialized parameters of ACA are as=20
follows:"<<endl; =
<BR>result<<"alfa=3D"<<alfa<<",=20
beta=3D"<<beta<<", rou=3D"<<rou<<",=20
Q=3D"<<Q<<endl; <BR>result<<"the maximum =
iteration number=20
of ACA is:"<<NcMax<<endl; <BR>result<<"the =
shortest=20
length of the path is:"<<BestSolution<<endl;=20
<BR>result<<"the best route is:"<<endl;=20
<BR>for(i=3D0;i<N;i++) <BR>result<<BestRoute[i]<<" =
";=20
<BR>result<<endl;=20
=
<BR>result<<"*-----------------------------------------------------=
--------------------*"<<endl<<endl;=20
<BR>result.close(); <BR>cout<<"the shortest length of the =
path=20
is:"<<BestSolution<<endl; <BR>} <BR><BR><BR><SPAN=20
style=3D"COLOR: red">double EvalueSolution(int *a) </SPAN><BR>{ =
<BR>double=20
dist=3D0; <BR>for(int i=3D0;i<N-1;i++) =
<BR>dist+=3Ddistance[a[i]][a[i+1]];=20
<BR>dist+=3Ddistance[a[i]][a[0]]; <BR>return dist; <BR>} =
<BR><BR><BR>void=20
InCityXY( double x[], double y[], char *infile ) <BR>{ <BR>fstream =
inxyfile( infile, ios::in | ios::nocreate ); <BR>if( !inxyfile ) =
<BR>{=20
<BR>cout<<"can't open the <"<<infile<<"> =
file!\n";=20
<BR>exit(0); <BR>} <BR>int i=3D0; <BR>while( !inxyfile.eof() ) =
<BR>{=20
<BR>inxyfile>>x[i]>>y[i]; <BR>if( ++i >=3D N ) =
break; <BR>}=20
<BR>} </FONT></SPAN></P>
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style=3D"mso-bidi-font-size: 10.5pt"><FONT=20
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=CE=AAcity31.tsp=B5=C4=CE=C4=BC=FE=A3=AC=B4=E6=B7=C531=B8=F6=B3=C7=CA=D0=B5=
=C4=D7=F8=B1=EA=A1=A3</FONT></SPAN></P></DIV></TD></TR></TBODY></TABLE><B=
R>
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var hasMore =3D arg[0];
var D=3Dfunction(A,B){A[A.length]=3DB;}
if(arg.length % 2 =3D=3D 0) D(arg, ["","","",""]);
var html =3D ['<div id=3D"in_related_doc"><div =
class=3D"tit">=CF=E0=B9=D8=CE=C4=D5=C2=A3=BA</div>'];
D(html, '<table cellpadding=3D"0" cellspacing=3D"3" border=3D"0">');
for(var i =3D 1, j =3D arg.length; i < j; i +=3D 2){
D(html, '<tr>');
D(html, '<td width=3D"15px"><a style=3D"font-size:25px" =
>•</a></td><td><a href=3D"http://hi.baidu.com/' + arg[i][3] + =
'/blog/item/' + arg[i][2] + '.html" target=3D"_blank" title=3D"' + =
arg[i][0] + '">' + arg[i][1] + '</a>');
D(html, new Array(10).join('\u3000'));
D(html, '</td>');
if(arg[i + 1][0] !=3D "")
D(html, '<td width=3D"15px"><a style=3D"font-size:25px" =
>•</a></td><td><a href=3D"http://hi.baidu.com/' + arg[i + 1][3] + =
'/blog/item/' + arg[i + 1][2] + '.html" target=3D"_blank" title=3D"' + =
arg[i + 1][0] + '">' + arg[i + 1][1] + '</a></td>');
else
D(html, '<td> </td><td> </td>');
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