Module « scipy.sparse.csgraph »

Fonction csgraph_from_masked - module scipy.sparse.csgraph

Signature de la fonction csgraph_from_masked

Description

csgraph_from_masked.__doc__

    csgraph_from_masked(graph)

    Construct a CSR-format graph from a masked array.

    .. versionadded:: 0.11.0

    Parameters
    ----------
    graph : MaskedArray
        Input graph.  Shape should be (n_nodes, n_nodes).

    Returns
    -------
    csgraph : csr_matrix
        Compressed sparse representation of graph,

    Examples
    --------
    >>> import numpy as np
    >>> from scipy.sparse.csgraph import csgraph_from_masked

    >>> graph_masked = np.ma.masked_array(data =[
    ... [0, 1 , 2, 0],
    ... [0, 0, 0, 1],
    ... [0, 0, 0, 3],
    ... [0, 0, 0, 0]
    ...  ],
    ... mask=[[ True, False, False , True],
    ... [ True,  True , True, False],
    ... [ True , True,  True ,False],
    ... [ True ,True , True , True]],
    ... fill_value = 0)

    >>> csgraph_from_masked(graph_masked)
    <4x4 sparse matrix of type '<class 'numpy.float64'>'
        with 4 stored elements in Compressed Sparse Row format>