Module « scipy.sparse »

Fonction identity - module scipy.sparse

Signature de la fonction identity

def identity(n, dtype='d', format=None) 

Description

identity.__doc__

Identity matrix in sparse format

    Returns an identity matrix with shape (n,n) using a given
    sparse format and dtype.

    Parameters
    ----------
    n : int
        Shape of the identity matrix.
    dtype : dtype, optional
        Data type of the matrix
    format : str, optional
        Sparse format of the result, e.g., format="csr", etc.

    Examples
    --------
    >>> from scipy.sparse import identity
    >>> identity(3).toarray()
    array([[ 1.,  0.,  0.],
           [ 0.,  1.,  0.],
           [ 0.,  0.,  1.]])
    >>> identity(3, dtype='int8', format='dia')
    <3x3 sparse matrix of type '<class 'numpy.int8'>'
            with 3 stored elements (1 diagonals) in DIAgonal format>