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matlabdistance
Louis
Louis

Reputation: 1305

Cosine distance range interpretation

I am trying to use the cosine distance in pdist2. I am confused about it's output. As far as I know it should be between 0 and 1. Since MATLAB uses 1-(cosine), then 1 would be the highest variability while 0 would be the lowest. However the output seems to range from 0.5 to 1.5 or something along that!

Can somebody please advise me on how to interpret this output?

Upvotes: 2

Views: 2949

Answers (1)

Luis Mendo
Luis Mendo

Reputation: 112669

From help pdist2:

'cosine' - One minus the cosine of the included angle between observations (treated as vectors)

Since the cosine varies between -1 and 1, the result of pdist2(...'cosine') varies between 0 and 2. If you want the cosine, use 1-pdist2(matrix1,matrix2,'cosine').

Upvotes: 5

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