what is happening actually in the following code?

    K     = 8;                                            % Cluster Numbers
    CENTS = F( ceil(rand(K,1)*size(F,1)) ,:);             % Cluster Centers
    DAL   = zeros(size(F,1),K+2);                         % Distances and Labels
    KMI   = 10;                                           % K-means Iteration
    for n = 1:KMI
       for i = 1:size(F,1)
          for j = 1:K  
            DAL(i,j) = norm(F(i,:) - CENTS(j,:));      
          end
  *** I can't understand the below portions::::
          [Distance, CN] = min(DAL(i,1:K));               % 1:K are Distance from Cluster Centers 1:K 
          DAL(i,K+1) = CN;                                % K+1 is Cluster Label
          DAL(i,K+2) = Distance;                          % K+2 is Minimum Distance
       end

[Star Strider]

If my Answer to your previous Question:

what is the role of CEIL? (link)

solved your problem, please Accept it!

Answer 1

[Star Strider]

‘why CN is assigned to k+1 and distances to k+2 ?’

Apparently, whoever wrote the code designed the ‘DAL’ matrix to have specific data in specific columns.

Note that before the loop, ‘K’ is fixed at 8 and does not change within the code you posted, so ‘CN’ will be written in column 9 and ‘Distance’ in column 10 throughout the code.

Also, the min function with two outputs will return the first occurrence of the minimum value in the first output, and the index of that value in the second output. So ‘CN’ is the index, and ‘Distance’ is the value.

Answer 2

[Jan]

The documentation explains the used commands exhaustively. Did you read it?

[Distance, CN] = min(DAL(i,1:K));               % 1:K are Distance from Cluster

See doc min : Distance is the smallest element of the vector DAL(i,1:K), while CN is the index of this element.

DAL(i,K+1) = CN;                                % K+1 is Cluster Label
DAL(i,K+2) = Distance;                          % K+2 is Minimum Distance

Now these two values are stored in the Matrix "DAL".

[Touhidul islam]

DAL(i,K+1) = CN;                                
DAL(i,K+2) = Distance; 
why CN is assigned to k+1 and distances to k+2 ?