slip_endings.py~

import numpy as np

def slip_endings(x) :
    # returns indicies i for which x[i-1]>0 and x[i]=0
    starts = np.array([])
    prev = False
    for i in range(len(x)) :
        if (prev and not x[i]) :
            starts.append(i)
            prev = x[i]
    return starts