Module « scipy.signal »

Classe « dlti »

Informations générales

Héritage

builtins.object
    LinearTimeInvariant
        dlti

Définition

class dlti(LinearTimeInvariant):

Description _{[extrait de dlti.__doc__]}

    Discrete-time linear time invariant system base class.

    Parameters
    ----------
    *system: arguments
        The `dlti` class can be instantiated with either 2, 3 or 4 arguments.
        The following gives the number of arguments and the corresponding
        discrete-time subclass that is created:

            * 2: `TransferFunction`:  (numerator, denominator)
            * 3: `ZerosPolesGain`: (zeros, poles, gain)
            * 4: `StateSpace`:  (A, B, C, D)

        Each argument can be an array or a sequence.
    dt: float, optional
        Sampling time [s] of the discrete-time systems. Defaults to ``True``
        (unspecified sampling time). Must be specified as a keyword argument,
        for example, ``dt=0.1``.

    See Also
    --------
    ZerosPolesGain, StateSpace, TransferFunction, lti

    Notes
    -----
    `dlti` instances do not exist directly. Instead, `dlti` creates an instance
    of one of its subclasses: `StateSpace`, `TransferFunction` or
    `ZerosPolesGain`.

    Changing the value of properties that are not directly part of the current
    system representation (such as the `zeros` of a `StateSpace` system) is
    very inefficient and may lead to numerical inaccuracies.  It is better to
    convert to the specific system representation first. For example, call
    ``sys = sys.to_zpk()`` before accessing/changing the zeros, poles or gain.

    If (numerator, denominator) is passed in for ``*system``, coefficients for
    both the numerator and denominator should be specified in descending
    exponent order (e.g., ``z^2 + 3z + 5`` would be represented as ``[1, 3,
    5]``).

    .. versionadded:: 0.18.0

    Examples
    --------
    >>> from scipy import signal

    >>> signal.dlti(1, 2, 3, 4)
    StateSpaceDiscrete(
    array([[1]]),
    array([[2]]),
    array([[3]]),
    array([[4]]),
    dt: True
    )

    >>> signal.dlti(1, 2, 3, 4, dt=0.1)
    StateSpaceDiscrete(
    array([[1]]),
    array([[2]]),
    array([[3]]),
    array([[4]]),
    dt: 0.1
    )

    Construct the transfer function
    :math:`H(z) = \frac{5(z - 1)(z - 2)}{(z - 3)(z - 4)}` with a sampling time
    of 0.1 seconds:

    >>> signal.dlti([1, 2], [3, 4], 5, dt=0.1)
    ZerosPolesGainDiscrete(
    array([1, 2]),
    array([3, 4]),
    5,
    dt: 0.1
    )

    Construct the transfer function :math:`H(z) = \frac{3z + 4}{1z + 2}` with
    a sampling time of 0.1 seconds:

    >>> signal.dlti([3, 4], [1, 2], dt=0.1)
    TransferFunctionDiscrete(
    array([3., 4.]),
    array([1., 2.]),
    dt: 0.1
    )

    

Constructeur(s)

Signature du constructeur	Description
__new__(cls, *system, **kwargs)	Create an instance of the appropriate subclass. [extrait de __new__.__doc__]
__init__(self, *system, **kwargs)

Liste des opérateurs

Opérateurs hérités de la classe object

__eq__, __ge__, __gt__, __le__, __lt__, __ne__

Méthodes héritées de la classe LinearTimeInvariant

__init_subclass__, __subclasshook__

Méthodes héritées de la classe object

__delattr__, __dir__, __format__, __getattribute__, __hash__, __reduce__, __reduce_ex__, __repr__, __setattr__, __sizeof__, __str__