Module « numpy.matlib »

Fonction set_numeric_ops - module numpy.matlib

Signature de la fonction set_numeric_ops

Description

set_numeric_ops.__doc__

set_numeric_ops(op1=func1, op2=func2, ...)

    Set numerical operators for array objects.

    .. deprecated:: 1.16

        For the general case, use :c:func:`PyUFunc_ReplaceLoopBySignature`.
        For ndarray subclasses, define the ``__array_ufunc__`` method and
        override the relevant ufunc.

    Parameters
    ----------
    op1, op2, ... : callable
        Each ``op = func`` pair describes an operator to be replaced.
        For example, ``add = lambda x, y: np.add(x, y) % 5`` would replace
        addition by modulus 5 addition.

    Returns
    -------
    saved_ops : list of callables
        A list of all operators, stored before making replacements.

    Notes
    -----
    .. WARNING::
       Use with care!  Incorrect usage may lead to memory errors.

    A function replacing an operator cannot make use of that operator.
    For example, when replacing add, you may not use ``+``.  Instead,
    directly call ufuncs.

    Examples
    --------
    >>> def add_mod5(x, y):
    ...     return np.add(x, y) % 5
    ...
    >>> old_funcs = np.set_numeric_ops(add=add_mod5)

    >>> x = np.arange(12).reshape((3, 4))
    >>> x + x
    array([[0, 2, 4, 1],
           [3, 0, 2, 4],
           [1, 3, 0, 2]])

    >>> ignore = np.set_numeric_ops(**old_funcs) # restore operators