Using clusterdata and extracting data from it's indexes.

Question

0 个投票

Hello,

I have an array of points say A = [1,13,14,2,15,16,3,17];

I use clusterdata (with criterion as distance) which returns me the cluster number each data point in A belongs to:

T = [1,2,2,1,2,2,1,2];

I want to have a new array which separates these data points into:

B = [1,2,3] C = [13,14,15,16,17]

How do I achieve this?

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Answer 1

Guillaume 2015-4-15

编辑：Guillaume 2015-4-15

1 个投票

A very simple but possibly obscure way is to use accumarray:

Asplit = accumarray(T', A, [], @(v) {v});

Note that the output is a cell array where each cell is a cluster. It's much better to use a cell array than individually named variables.

The above line is equivalent to:

Asplit = cell(max(T), 1);
for cluster = 1:max(T)
   Asplit{cluster} = A(T == cluster);
end

Izuru 2015-4-15

That worked great thanks. One more simple question, the output I get says:

Asplit = [20x1 single] [16x1 single] etc

How do i display the values of that array? Sorry it's been a while since using matlab...

Izuru 2015-4-15

Never mind I found it! Cheers