function [f,T]=trp(d,t0,tf)
% f为目标函数最优值，T为最优路线，d为距离矩阵，t0为初始温度，tf为结束温度
d=[0, 10, 15, 6, 2;10, 0, 8, 13, 9;15, 8, 0, 20, 15;6, 13, 20, 0, 5;2, 9, 15, 5, 0];
t0=10; tf=0.7;
[m,n]=size(d);
L=100*n;
t=t0;
pi0=1:n;
min_f=0;
for k=1:(n-1)
min_f=min_f+d(pi0(k),pi0(k+1));
end
min_f=min_f+d(pi0(n),pi0(1));
p_min=pi0;
while t>tf
for k=1:L
kk=rand;
[d_f,pi_1]=exchange_2(pi0,d);
r_r=rand;
if d_f<0
pi0=pi_1;
elseif exp(d_f/t)>r_r
pi0=pi_1;
else
pi0=pi0;
end
end
f_temp=0;
for k=1:n-1
f_temp=f_temp+d(pi0(k),pi0(k+1));
end
f_temp=f_temp+d(pi0(n),pi0(1));
if min_f>f_temp
min_f=f_temp;
p_min=pi0;
end
t=0.87*t;
end
f=min_f;
T=p_min;
%下面的函数产生新解
function [d_f,pi_r]=exchange_2(pi0,d)
[m,n]=size(d);
clear m;
u=rand;
u=u*(n-2);
u=round(u);
if u<2
u=2;
end
if u>n-2
u=n-2;
end
v=rand;
v=v*(n-u+1);
v=round(v);
if v<1
v=1;
end
v=u+v;
if v>n
v=n;
end
pi_1(u)=pi0(v);
pi_1(v)=pi0(u);
if u>1
for k=1:u-1
pi_1(k)=pi0(k);
end
end
if v>u+1
for k=1:(v-u-1)
pi_1(u+k)=pi0(v-k);
end
end
if v<n
for k=(v+1):n
pi_1(k)=pi0(k);
end
end
d_f=0;
if v<n
d_f=d(pi0(u-1),pi0(v))+d(pi0(u),pi0(v+1));
for k=(u+1):n
d_f=d_f+d(pi0(k),pi0(k-1));
end
d_f=d_f-d(pi0(u-1),pi0(u))-d(pi0(v),pi0(v+1));
for k=(u+1):n
d_f=d_f-d(pi0(k-1),pi0(k));
end
else
d_f=d(pi0(u-1),pi0(v))+d(pi0(u),pi0(1))-d(pi0(u-1),pi0(u))-d(pi0(v),pi0(1));
for k=(u+1):n
d_f=d_f+d(pi0(k),pi0(k-1));
end
for k=(u+1):n
d_f=d_f-d(pi0(k-1),pi0(k));
end
end
pi_r=pi_1;
