Problem with Cluster command
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Walter Johnson
am 24 Jan. 2020
Beantwortet: Walter Johnson
am 26 Jan. 2020
When I ran the following three commands from the Statistics and Machine Learning Toolbox in the shown order, in my command window
Y = pdist(X)
Z - linkage(Y)
T = cluster(Z,'cutoff',1.2)
where X is 3042x53 matrix of type double, I get the following error (just after I execute statement 3) "Index in position 1 is invalid. Array indices must be positive integers or logical values." I then repeated these commands with a smaller X input (4x8). Same result. I believe that "cluster" wants integers for the first two columns of the Z input, (Z was produced by linkage) but the last column of Z is a distance measure and is real - so all columns of Z must be real. What am I doing wrong or misunderstanding?
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Walter Roberson
am 24 Jan. 2020
Z = linkage(squareform(Y)) ;
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Walter Roberson
am 26 Jan. 2020
It does happen a fair bit, most commonly with a variable named sum .
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