why is centroid negative

2012 3 15
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My data are all non-negative. How can a centroid from kmeans have a negative value? My data are time series and I use most distance functions (to compare clusters). Each centroid is a time series, and should have C(t) >= min(data). Am I missing something?

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Image Analyst
Image Analyst 2012-3-15
So you have a scatter plot with the "x" axis being time, t, and the "y" axis being C? And neither x nor y (t nor C(t)) have negative values. Is that correct?
Harvey
Harvey 2012-3-16
that is correct. I have t = 1:H and x >= 0, where x is N by H matrix. The centroid has C(t) < 0.
Image Analyst
Image Analyst 2012-3-16
Please supply some sample data that illustrates your situation.

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Harvey
Harvey
2012-3-15

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