How can I add arrows onto the particles in my movie that indicate there movement with my code and how can I calculate the square displacement of each particle.

N=10; % number of integrins
L=100; % size of the domain 100nm
D=.01; % diffusion coefficient
dt=1; % time step
F=randi([1, 10],1); % force on the bond with a random number of 1 to 10
P_a=randi([0,1],1); % binding rate of a random number from 0 to 1
P_ub=1/(1.5*F); % unbinding rate based upon our previous values
Tmax=500; % max time
% Intialize our integrins
x=randi([0,360],N,1); % x-coordinates generated randomily for each integrin
y=randi([0,50],N,1); % y-coordinates generated for each 
state=ones(N,1); % Each integrin is set to an inactive state at 0
% our figure
figure;
axis([0 L 0 L]);
set(gca,'nextplot','replacechildren');
% position update
for t = 0:dt:Tmax
% colors for our integrin states
colors = repmat([1 0 0], N,1); % red for inactive state
colors(state == 2,:,:) = repmat([0 1 0],sum(state == 2),1);
% plotting our integrins
 scatter(x,y,50,colors,'filled');
 title(sprintf('Time=%.2f',t));
 drawnow;
     for i=1:N
         w=randi([0,1],1); 
         if state(i)==1
         dx=randi([-360,360],1);
         dy=randi([-50,50],1);
         x(i)=x(i)+dx;
         y(i)=y(i)+dy; 
         end 
     end
     x=mod(x,L);
     y=mod(y,L);
     for i=1:N
         w_1=randi([0,1],1);
         if w_1 < P_a && state(i)==1
             state(i)=2;
             
         end
     end
     for i=1:N
         w1=randi([0,1],1);
         if state(i)==2 && w1<P_ub
            state(i)=1;
        
         end
     end
    
end

[Walter Roberson]

what is the difference between this and https://www.mathworks.com/matlabcentral/answers/1956874-how-can-i-add-arrows-to-each-integrin-particle-in-my-plot-that-is-moving?s_tid=srchtitle

Answer 1

[Walter Roberson]

 sqrt(mean(x.^2))

You can add arrows using quiver() or annotation()

However given the color requirements you can tell they expect you to use scatter plots of current and previous positions with different colors for different states.

[BAILEY MCMASTER]

yes, how can I add a arrow onto the integrin that is moving during the movie, to show its displacement.