what is happening actually in the following code?

1 次查看（过去 30 天）
Touhidul islam
Touhidul islam 2017-12-29
回答： Star Strider 2017-12-29
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

请先登录，再回答此问题。

采纳的回答

Star Strider
Star Strider 2017-12-29
‘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.

更多回答（1 个）

Jan
Jan 2017-12-29
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".

类别

在 Help Center 和 File Exchange 中查找有关 Cluster Analysis and Anomaly Detection 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by