def weighted(y):
return linkage(y, method='<STR_LIT>', metric='<STR_LIT>')<EOL>
Performs weighted/WPGMA linkage on the condensed distance matrix.

See ``linkage`` for more information on the return
structure and algorithm.

Parameters
----------
y : ndarray
    The upper triangular of the distance matrix. The result of
    ``pdist`` is returned in this form.

Returns
-------
Z : ndarray
    A linkage matrix containing the hierarchical clustering. See
    the ``linkage`` function documentation for more information
    on its structure.

See Also
--------
linkage : for advanced creation of hierarchical clusterings.