scipy.signal.argrelmax#
- scipy.signal.argrelmax(data, axis=0, order=1, mode='clip')[source]#
Calculate the relative maxima of data.
- Parameters:
- datandarray
Array in which to find the relative maxima.
- axisint, optional
Axis over which to select from data. Default is 0.
- orderint, optional
How many points on each side to use for the comparison to consider
comparator(n, n+x)
to be True.- modestr, 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:
- extrematuple 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
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 datafind_peaks
can be used to detect all local maxima, including flat ones.New in version 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]))