scipy.cluster.hierarchy.is_valid_linkage

scipy.cluster.hierarchy.is_valid_linkage(Z, warning=False, throw=False, name=None)

Checks the validity of a linkage matrix.

A linkage matrix is valid if it is a two dimensional array (type double) with \(n\) rows and 4 columns. The first two columns must contain indices between 0 and \(2n-1\). For a given row i, the following two expressions have to hold:

\[0 \leq \mathtt{Z[i,0]} \leq i+n-1 0 \leq Z[i,1] \leq i+n-1\]

I.e. a cluster cannot join another cluster unless the cluster being joined has been generated.

Parameters:

Z : array_like

Linkage matrix.

warning : bool, optional

When True, issues a Python warning if the linkage matrix passed is invalid.

throw : bool, optional

When True, throws a Python exception if the linkage matrix passed is invalid.

name : str, optional

This string refers to the variable name of the invalid linkage matrix.

Returns:

b : bool

True if the inconsistency matrix is valid.