Up Move.

    Formula:
    UPMOVE = Ht - Ht-1

def calculate_up_moves(high_data):
    """
    Up Move.

    Formula:
    UPMOVE = Ht - Ht-1
    """
    up_moves = [high_data[idx] - high_data[idx-1] for idx in range(1, len(high_data))]
    return [np.nan] + up_moves