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scipy.signal.

# argrelmin

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

  Calculate the relative minima of data.

  Parameters:
    data ndarray

      Array in which to find the relative minima.

    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 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]))