).

 Note the cluster means M do not refer to the actual mean of the points
 that belong to the same cluster, but rather the values to which the
 meanShift algorithm converged for each given point (recall that cluster
 membership is based on the mean converging to the same value from
 different points).  Hence M is not the same as C, the centroid of the
 points [see kmeans2 for a definition of C].

 USAGE
  [IDX,M] = meanShift(X, radius, [rate], [maxIter], [minCsize], [blur] )

 INPUTS
  X           - colum