Derivative of an array in python?

Question

Currently I have two numpy arrays: x and y of the same size.

I would like to write a function (possibly calling numpy/scipy... functions if

Answer 1

Would something like this solve your problem?

def get_inflection_points(arr, n=1):
    """
    returns inflextion points from array
        arr: array
        n: n-th discrete difference
    """
    inflections = []
    dx = 0
    for i, x in enumerate(np.diff(arr, n)):
        if x >= dx and i > 0:
            inflections.append(i*n)
        dx = x
    return inflections