Converts a linkage matrix generated by MATLAB(TM) to a new linkage matrix compatible with this module. The conversion does two things:

  • the indices are converted from 1..N to 0..(N-1) form, and
  • a fourth column Z[:,3] is added where Z[i,3] is represents the number of original observations (leaves) in the non-singleton cluster i.

This function is useful when loading in linkages from legacy data files generated by MATLAB.

Parameters :

Z : ndarray

A linkage matrix generated by MATLAB(TM).

Returns :

ZS : ndarray

A linkage matrix compatible with this library.

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