def monotonic_incr(sequence, values):
    """See if a sequence of values is monotonically increasing.

    Parameters
    ----------
    sequence : list, tuple, 1D-array (dtype = int).
        Each element is an index for accessing a value from values.

    values : list, tuple, 1D-array (dtype = float, int).
        Stores all possible values that can occur in a sequence.

    Returns
    -------
    bool: True, False.
        True if sequence is monotonically increasing. Allows for neutral steps. False if not monotonically increasing.
    """

    for i in range(len(sequence)-1):
        if values[sequence[i]] > values[sequence[i+1]]:
            return False
    return True