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Could anyone help me to solve the issue.

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jaah navi
jaah navi on 8 May 2019
Commented: Bhaskar R on 9 May 2019
code:The below code executes and gives the result.
But i want to view swarm_pos for all particles in workspace.
When I run the code it displays only with respect to the second time of for loop result in workspace.
could anyone please help me on this.
particles=2;
dimensions=2;
PPP=[1,2;
3,4;
5,6;
7,8];
centroids=zeros(1,particles);
for particle=1:particles
P=numel(particle);
users=size(PPP,1);
centroids(particle)= randi(users,1,P)
fprintf('\nCentroids=%d\n',centroids(particle))
swarm_pos =rand(centroids(particle),dimensions,P)
end

Accepted Answer

Bhaskar R
Bhaskar R on 8 May 2019
Edited: Bhaskar R on 8 May 2019
Since the matrix size assigning to the variable "swarm_pos" is deifferent for each iteration, initialize the matrix as cell array class matrix, then you can get the variable as you required in the workspace
Modify your code as below
particles=2;
dimensions=2;
PPP=[1,2;
3,4;
5,6;
7,8];
centroids=zeros(1,particles);
% Initialize your variable as cell array type as your required dimention either (1xparticles) or (particlesx1)
swarm_pos = cell(1,particles);
for particle=1:particles
P=numel(particle);
users=size(PPP,1);
centroids(particle)= randi(users,1,P)
fprintf('\nCentroids=%d\n',centroids(particle))
swarm_pos{particle} =rand(centroids(particle),dimensions,P) % stores array values for each iteration
end
Access you data as
swarm_pos{1}, swarm_pos{2}

  2 Comments

jaah navi
jaah navi on 9 May 2019
ok.It works
I then continued the code as follows:
particles=2;
dimensions=2;
PPP=[1,2;
3,4;
5,6;
7,8];
centroids=zeros(1,particles);
swarm_pos = cell(1,particles);
for particle=1:particles
P=numel(particle);
users=size(PPP,1);
centroids(particle)= randi(users,1,P)
fprintf('\nCentroids=%d\n',centroids(particle))
swarm_pos{particle} =rand(centroids(particle),dimensions,P) % stores array values for each iteration
end
for T=1:iterations
for particle=1:particles
P=numel(particle);
distances=zeros(users,centroids(particle),P)
for centroid=1:centroids(particle)
distance=zeros(users(particle),1);
for user=1:users
distance(user,1)=norm(swarm_pos(centroid,:,P)-PPP(user,:))
end
distances(:,centroid,P)=distance
end
end
end
wheni run the code i am getting error stating Undefined operator '-' for input arguments of type 'cell'.
Could you please help me to overcome it.
Bhaskar R
Bhaskar R on 9 May 2019
As I don't know your requiremet i couldn't get how are you doing norm at error occured.
Any way I can suggest you to access values from the the variable "swarm_pos" you can make change as
distance(user,1)=norm(swarm_pos{particle}(centroid,:,P)-PPP(user,:));
Even this modification is not enough for you, you get error in the statement
distance=zeros(users(particle),1);
because users is the scaler variable
I need these point to rectify error

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