Classe « dok_matrix »

Informations générales

Héritage

builtins.object
    builtins.dict
builtins.object
    IndexMixin
builtins.object
    spmatrix
        dok_matrix

Définition

class dok_matrix(spmatrix, IndexMixin, builtins.dict):

Description _{[extrait de dok_matrix.doc]}

    Dictionary Of Keys based sparse matrix.

    This is an efficient structure for constructing sparse
    matrices incrementally.

    This can be instantiated in several ways:
        dok_matrix(D)
            with a dense matrix, D

        dok_matrix(S)
            with a sparse matrix, S

        dok_matrix((M,N), [dtype])
            create the matrix with initial shape (M,N)
            dtype is optional, defaulting to dtype='d'

    Attributes
    ----------
    dtype : dtype
        Data type of the matrix
    shape : 2-tuple
        Shape of the matrix
    ndim : int
        Number of dimensions (this is always 2)
    nnz
        Number of nonzero elements

    Notes
    -----

    Sparse matrices can be used in arithmetic operations: they support
    addition, subtraction, multiplication, division, and matrix power.

    Allows for efficient O(1) access of individual elements.
    Duplicates are not allowed.
    Can be efficiently converted to a coo_matrix once constructed.

    Examples
    --------
    >>> import numpy as np
    >>> from scipy.sparse import dok_matrix
    >>> S = dok_matrix((5, 5), dtype=np.float32)
    >>> for i in range(5):
    ...     for j in range(5):
    ...         S[i, j] = i + j    # Update element

Constructeur(s)

Signature du constructeur	Description
__init__(self, arg1, shape=None, dtype=None, copy=False)

Liste des attributs statiques

Nom de l'attribut	Valeur
format	dok
ndim	2

Liste des propriétés

Nom de la propriété	Description
nnz	Number of stored values, including explicit zeros. _{[extrait de __doc__]}
shape	Get shape of a matrix. _{[extrait de __doc__]}

Liste des opérateurs

Signature de l'opérateur	Description
__add__(self, other)
__imul__(self, other)
__itruediv__(self, other)
__neg__(self)
__radd__(self, other)
__truediv__(self, other)

Opérateurs hérités de la classe dict

__contains__, __delitem__, __eq__, __ge__, __getitem__, __gt__, __ior__, __le__, __lt__, __ne__, __or__, __ror__, __setitem__

Opérateurs hérités de la classe IndexMixin

__getitem__, __setitem__

Opérateurs hérités de la classe spmatrix

__eq__, __ge__, __gt__, __iadd__, __isub__, __le__, __lt__, __matmul__, __mul__, __ne__, __pow__, __rmul__, __rsub__, __rtruediv__, __sub__

Liste des méthodes

Toutes les méthodes Méthodes d'instance Méthodes statiques

Signature de la méthode	Description
__class_getitem__	See PEP 585 _{[extrait de __class_getitem__.__doc__]}
__len__(self)
__reduce__(self)
conjtransp(self)	Return the conjugate transpose. _{[extrait de conjtransp.__doc__]}
copy(self)	Returns a copy of this matrix. _{[extrait de copy.__doc__]}
count_nonzero(self)	Number of non-zero entries, equivalent to _{[extrait de count_nonzero.__doc__]}
fromkeys(iterable, value=None)	Create a new dictionary with keys from iterable and values set to value. _{[extrait de fromkeys.__doc__]}
get(self, key, default=0.0)	This overrides the dict.get method, providing type checking _{[extrait de get.__doc__]}
getnnz(self, axis=None)	Number of stored values, including explicit zeros. _{[extrait de getnnz.__doc__]}
resize(self, *shape)	Resize the matrix in-place to dimensions given by ``shape`` _{[extrait de resize.__doc__]}
set_shape(self, shape)
tocoo(self, copy=False)	Convert this matrix to COOrdinate format. _{[extrait de tocoo.__doc__]}
tocsc(self, copy=False)	Convert this matrix to Compressed Sparse Column format. _{[extrait de tocsc.__doc__]}
todok(self, copy=False)	Convert this matrix to Dictionary Of Keys format. _{[extrait de todok.__doc__]}
transpose(self, axes=None, copy=False)
update(self, val)

Méthodes héritées de la classe dict

__getattribute__, __init_subclass__, __iter__, __repr__, __reversed__, __sizeof__, __subclasshook__, clear, items, keys, pop, popitem, setdefault, values

Méthodes héritées de la classe IndexMixin

__init_subclass__, __subclasshook__, getcol, getrow

Méthodes héritées de la classe spmatrix

__abs__, __bool__, __div__, __getattr__, __idiv__, __iter__, __nonzero__, __rdiv__, __repr__, __rmatmul__, __round__, __str__, asformat, asfptype, astype, conj, conjugate, diagonal, dot, get_shape, getformat, getH, getmaxprint, maximum, mean, minimum, multiply, nonzero, power, reshape, setdiag, sum, toarray, tobsr, tocsr, todense, todia, tolil

Méthodes héritées de la classe object

__delattr__, __dir__, __format__, __getattribute__, __hash__, __reduce_ex__, __setattr__, __sizeof__

Améliorations / Corrections