# scipy.signal.argrelmax¶

scipy.signal.argrelmax(data, axis=0, order=1, mode='clip')[source]

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. 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 one-dimensional.

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 one-dimensional data find_peaks can be used to detect all local maxima, including flat ones.

New in version 0.11.0.

Examples

>>> 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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