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Module « scipy.signal »

Fonction argrelmax - module scipy.signal

Signature de la fonction argrelmax

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

Description

help(scipy.signal.argrelmax)

Calculate the relative maxima of `data`.

Parameters
----------
data : ndarray
    Array in which to find the relative maxima.
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.
    Available options are 'wrap' (wrap around) or 'clip' (treat overflow
    as the same as the last (or first) element).
    Default '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
--------
argrelextrema, argrelmin, find_peaks

Notes
-----
This function uses `argrelextrema` with np.greater as comparator. Therefore,
it  requires a strict inequality on both sides of a value to consider it a
maximum. This means flat maxima (more than one sample wide) are not detected.
In case of 1-D `data` `find_peaks` can be used to detect all
local maxima, including flat ones.

.. versionadded:: 0.11.0

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

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