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function [maxX,maxY,maxValue]=myAnt Ant=200; Times=150; Rou=0.2; P0=0.5; Lower_1=0; Upper_1=1; Lower_2=0; Upper_2=3; for i=1:Ant X(i,1)=(Lower_1+(Upper_1-Lower_1)*rand); X(i,2)=(Lower_2+(Upper_2-Lower_2)*rand); Tau(i)=F(X(i,1),X(i,2)); end step=0.05; f='-((x-1).^2+(y-2.2).^2+1)'; [x,y]=meshgrid(Lower_1:step:Upper_1,Lower_2:step:Upper_2); z=eval(f); figure(1); mesh(x,y,z); hold on; plot3(X(:,1),X(:,2),Tau,'k*') hold on; text(0.1,0.8,-0.1,'蚂蚁的初始分布位置'); xlabel('x');ylabel('y');zlabel('f(x,y)'); for T=1:Times lamda=1/T; [Tau_Best(T),BestIndex]=max(Tau); for i=1:Ant P(T,i)=(Tau(BestIndex)-Tau(i))/Tau(BestIndex); end for i=1:Ant if P(T,i)<P0 temp1=X(i,1)+(2*rand-1)*lamda; temp2=X(i,2)+(2*rand-1)*lamda; else temp1=X(i,1)+(Upper_1-Lower_1)*(rand-0.5); temp2=X(i,2)+(Upper_2-Lower_2)*(rand-0.5); end if temp1<Lower_1 temp1=Lower_1; end if temp1>Upper_1 temp1=Upper_1; end if temp2<Lower_2 temp2=Lower_2; end if temp2>Upper_2 temp2=Upper_2; end if F(temp1,temp2)>F(X(i,1),X(i,2)) X(i,1)=temp1; X(i,2)=temp2; end end for i=1:Ant Tau(i)=(1-Rou)*Tau(i)+F(X(i,1),X(i,2)); end end figure(2); mesh(x,y,z); hold on; x=X(:,1); y=X(:,2); plot3(x,y,eval(f),'k*'); hold on; text(0.1,0.8,-0.1,'蚂蚁的最终分布位置'); xlabel('x');ylabel('y');zlabel('f(x,y)'); [max_value,max_index]=max(Tau); maxX=X(max_index,1); maxY=X(max_index,2); maxValue=F(X(max_index,1),X(max_index,2)); function [F]=F(x1,x2) F=-((x1-1)^2+(x2-2.2)^2+1);