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Module « scipy.signal »

Fonction argrelextrema - module scipy.signal

Signature de la fonction argrelextrema

def argrelextrema(data, comparator, axis=0, order=1, mode='clip') 

Description

help(scipy.signal.argrelextrema)

Calculate the relative extrema of `data`.

Parameters
----------
data : ndarray
    Array in which to find the relative extrema.
comparator : callable
    Function to use to compare two data points.
    Should take two arrays as arguments.
axis : int, optional
    Axis over which to select from `data`. Default is 0.
order : int, optional
    How many points on each side to use for the comparison
    to consider ``comparator(n, n+x)`` to be True.
mode : str, optional
    How the edges of the vector are treated. 'wrap' (wrap around) or
    'clip' (treat overflow as the same as the last (or first) element).
    Default is 'clip'. See `numpy.take`.

Returns
-------
extrema : tuple of ndarrays
    Indices of the maxima in arrays of integers. ``extrema[k]`` is
    the array of indices of axis `k` of `data`. Note that the
    return value is a tuple even when `data` is 1-D.

See Also
--------
argrelmin, argrelmax

Notes
-----

.. versionadded:: 0.11.0

Examples
--------
>>> import numpy as np
>>> from scipy.signal import argrelextrema
>>> x = np.array([2, 1, 2, 3, 2, 0, 1, 0])
>>> argrelextrema(x, np.greater)
(array([3, 6]),)
>>> y = np.array([[1, 2, 1, 2],
...               [2, 2, 0, 0],
...               [5, 3, 4, 4]])
...
>>> argrelextrema(y, np.less, axis=1)
(array([0, 2]), array([2, 1]))

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