scipy.signal.

argrelmin#

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

Calculate the relative minima of data.

Parameters:

datandarray: Array in which to find the relative minima.
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 minima 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, argrelmax, find_peaks

Notes

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

Added in version 0.11.0.

Examples

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