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This article will explain in detail what are the tool functions in matlab. The editor thinks it is very practical, so I share it for you as a reference. I hope you can get something after reading this article.

Function D=Distanse (a)%% calculate the distance between two cities, input a location coordinates of each city, output D the distance between two cities row=size (ascore 1); D=zeros (row,row); for i=1:rowfor j=i+1:rowD (iMague j) = ((a (iMagazine 1)-a (jjcent 1)) ^ 2 + (a (iMagol 2)-a (jjcent 2)) ^ 2) ^ 0.5 position D (jjinger I) = D (endend j);

Function DrawPath (Chrom,X)% draw path function% enter% Chrom path to be painted% X City coordinate location R = [Chrom (1Mague:) Chrom (1Magi 1)];% A random solution (individual) figure Hold onplot (X (:, 1), X (:, 2), hold onplot (X (:, 1), X (:, 2), plot (X (Chrom (1), 1), X (Chrom (1), 2), 'rv','MarkerSize',20) for i=1:size (X1) text (X (iMag1) + 0.05 rv','MarkerSize',20 X (I),' color', (1)); endA=X (RJE:); row=size (A1) For i=2:row [arrowx,arrowy] = dsxy2figxy (gca,A (imur1)), A (iMur1);% coordinate transformation annotation ('textarrow',arrowx,arrowy,'HeadWidth',8,'color', [0pc0pl]); endhold offxlabel (' Abscissa') ylabel ('ordinate') title ('trajectory') box on

Function p=OutputPath (R)%% output path function% input: r path R = [R _ Magi R (1)]; N=length (R); p=num2str (R (1)); for ionomer 2purn NP = [pJournal->', num2str (R (I))]; enddisp (p)

Function len=PathLength (DMagol Chrom)%% calculate the path length of each individual% input:% D distance between two cities% Chrom individual trajectory [row,col] = size (D); NIND=size (Chrom,1); len=zeros (NIND,1); for iMagne Chrom NINDp = [Chrom (1:end-1:) Chrom (iMagne1)]; i1mirp (1:end-1); i2plump (2:end); len (iMagne1) = sum (D ((i1-1) * col+i2)); end

Function S2=NewAnswer (S1)% input% S1: current solution%% output% S2: new solution N=length (S1); S2fuge S1 * (Nmuri 1) + 1);% generate two random positions to exchange W=S2 (a (1)); S2 (a (1)) = S2 (a (2)); S2 (a (2)) = W;% get a new route

Function [SMagol R] = Metropolis (S1Magol S2Magazine T)% input% S1: current solution% S2: new solution% D: distance matrix (distance between two cities)% T: current temperature% output% S: next current solution% R: next current solution% R1=PathLength (DMagne S1);% calculate route length N=length (S1);% get the number of cities

R2=PathLength (DMagazine S2);% calculate route length dC=R2-R1;% difference in computing ability if dC=rand% accept the new route with the probability of exp (- dC/T)

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