argrelmax(data, axis=0, order=1, mode='clip')¶
Calculate the relative maxima of data.
- 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
- 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.
This function uses
argrelextremawith 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_peakscan be used to detect all local maxima, including flat ones.
New in version 0.11.0.
>>> 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(), array())