slope_derivative

slope_derivative(X: ndarray) → ndarray

Numba slope derivative transformation for a 1d numpy array.

Finds the derivative of the series, padding the first and last values so that the length stays the same.

Parameters:

X1d numpy array

A 1d numpy array of values

Returns:

arr1d numpy array

The slope derivative of the series

Examples

>>> import numpy as np
>>> from aeon.utils.numba.general import slope_derivative
>>> X = np.array([1, 2, 2, 3, 3, 3, 4, 4, 4, 4])
>>> X_der = slope_derivative(X)