id in the kmeans function

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Fredrik Scheie 2021-9-11

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https://ww2.mathworks.cn/matlabcentral/answers/1451424-id-in-the-kmeans-function

编辑： Image Analyst 2021-9-12

[id,C,SUMD]= kmeans(Dataset,3);

[3:43 PM]

I understand the C refers to the centroid, SumD which is set to the squared euclidean distance by default, but I am unsure as to what id does? I tried finding the documentation where it says idx (which I assume is the same as id) gives the cluster indices, so does that mean that it numerates the clusters somehow?

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Answer 1

Image Analyst 2021-9-12

1
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https://ww2.mathworks.cn/matlabcentral/answers/1451424-id-in-the-kmeans-function#answer_785559

编辑：Image Analyst 2021-9-12

id is the class identification number that kmeans() thinks each of your data rows best belongs to. So it you had, say 1000 points and told it to assume 3 clusters (classes), then kmeans will classify each of your data rows into one of the 3 clusters (classes) and return id, which will be a column vector of 1000 rows where each value is either 1, 2, or 3 depending on what cluster/class number it thinks that particular data point most likely belongs to.