Why 'Linkage' returns wrong result??

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YF
YF 2012-5-23
I use the distance matrix as W =
0 1 0 5
1 0 0 1
0 0 0 3
5 1 3 0
>> Z=linkage(W,'single')
Z =
2.0000 3.0000 2.2361
1.0000 5.0000 2.2361
4.0000 6.0000 5.1962
>> Z=linkage(W,'complete')
Z =
2.0000 3.0000 2.2361
1.0000 5.0000 4.2426
4.0000 6.0000 7.6811
above are wrong results
Somebody could tell me why,please??

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回答（1 个）

Tom Lane
Tom Lane 2012-5-24
Your distance matrix isn't in the vector form that pdist computes and linkage expects. So linkage is treating it as a data matrix. Try this:
Z=linkage(squareform(W),'single')

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