scipy.spatial.distance.is_valid_dm

scipy.spatial.distance.is_valid_dm(D, tol=0.0, throw=False, name='D', warning=False)

Returns True if the variable D passed is a valid distance matrix. Distance matrices must be 2-dimensional numpy arrays containing doubles. They must have a zero-diagonal, and they must be symmetric.

Parameters :

D : ndarray

The candidate object to test for validity.

tol : double

The distance matrix should be symmetric. tol is the maximum difference between the :math:`ij`th entry and the :math:`ji`th entry for the distance metric to be considered symmetric.

throw : bool

An exception is thrown if the distance matrix passed is not valid.

name : string

the name of the variable to checked. This is useful if throw is set to True so the offending variable can be identified in the exception message when an exception is thrown.

warning : bool

Instead of throwing an exception, a warning message is raised.

Returns :

Returns ``True`` if the variable ``D`` passed is a valid :

distance matrix. Small numerical differences in ``D`` and :

``D.T`` and non-zeroness of the diagonal are ignored if they are :

within the tolerance specified by ``tol``. :