Elevator Simulation.ipynb

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    "## Objective\n",
    "Design and implement a simulation of a building containing a single elevator and\n",
    "some number of passengers who want to travel from one floor in the building to another. You\n",
    "should implement at least two strategies (of which one strategy can be the example strategy\n",
    "below) and compare them based on which strategy is most efficient at transporting passengers\n",
    "around the building."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 23,
   "metadata": {},
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   "source": [
    "class Elevator():\n",
    "    \n",
    "    def __init__(self, max_weight, current_weight=0, floor=0,\n",
    "                 buttons_pressed=False, going_up=True, door_open=False):\n",
    "        \n",
    "        self.floor = floor\n",
    "        self.max_weight = max_weight\n",
    "        self.current_weight = current_weight\n",
    "        self.buttons_pressed = buttons_pressed\n",
    "        self.direction = direction\n",
    "        self.door_open = door_open\n",
    "        \n",
    "    def go_up(self, distance=1):\n",
    "        '''\n",
    "        Sends elevator down by #distance floors,\n",
    "        if not arg specified, goes down by 1 floor\n",
    "        '''\n",
    "        assert type(distance) is int, \"Distance must be an integer!\"\n",
    "        self.position += distance\n",
    "\n",
    "    def go_down(self, distance=1):\n",
    "        '''\n",
    "        Sends elevator down by #distance floors,\n",
    "        if not arg specified, goes down by 1 floor\n",
    "        '''\n",
    "        assert type(distance) is int, \"Distance must be an integer!\"\n",
    "        self.position -= distance\n",
    "    \n",
    "    def go_to(self, floor):\n",
    "        '''\n",
    "        Takes floor as input,\n",
    "        Moves elevator to floor\n",
    "        '''\n",
    "        assert type(floor) is int, \"Distance must be an integer!\"\n",
    "        self.position = floor\n",
    "        \n",
    "    def open_door(self):\n",
    "        self.door_open = 0\n",
    "        \n",
    "    def close_door(self):\n",
    "        self.door_open = 1\n",
    "        \n",
    "        \n",
    "class Person():\n",
    "    \n",
    "    def __init__(self, weight, current_floor, destination, in_elevator=False):\n",
    "        self.weight = weight\n",
    "        self.current_floor = current_floor\n",
    "        self.destination = destination\n",
    "        self.in_elevator = in_elevator\n",
    "        \n",
    "    def enter_elevator(self):\n",
    "        self.in_elevator = True\n",
    "        \n",
    "    def exit_elevator(self):\n",
    "        self.in_elevator = False\n",
    "        \n",
    "        \n",
    "        \n",
    "class Building():\n",
    "    \n",
    "    def __init__(self, height, n_people, elevator_capacity):\n",
    "        '''\n",
    "        Building has a height, measured in number of floors\n",
    "        '''\n",
    "        \n",
    "        self.height = height\n",
    "        "
   ]
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  {
   "cell_type": "code",
   "execution_count": 36,
   "metadata": {},
   "outputs": [],
   "source": [
    "import scipy.stats as sts\n",
    "import random\n",
    "\n",
    "def random_weight():\n",
    "    '''\n",
    "    https://www.cdc.gov/nchs/fastats/body-measurements.htm\n",
    "    '''\n",
    "    \n",
    "    #If woman\n",
    "    if sts.uniform(0, 1).rvs() <= 0.5202:\n",
    "        return sts.norm(77.3, 15).rvs()\n",
    "    \n",
    "    #If man\n",
    "    else:\n",
    "        return sts.norm(89.7, 15).rvs()\n",
    "\n",
    "\n",
    "def up_and_down(people, building, elevator):\n",
    "    '''\n",
    "    Implementation of the example elevator strategy.\n",
    "    The elevator goes back and forth between bottom floor and top floor of the building\n",
    "    until all people have reached their destination\n",
    "    '''\n",
    "    \n",
    "    #People press the elevator button if it is not already pressed\n",
    "    elevator.buttons_pressed = np.unique([person.destination for person in people])\n",
    "    \n",
    "    while people:\n",
    "        \n",
    "        if elevator.going_up():\n",
    "            #Next stop in the direction of the elevator\n",
    "            next_stop = min(elevator.buttons_pressed)\n",
    "            print(next_stop)\n",
    "        \n",
    "        \n",
    "        #If elevator has reached top or bottom floor, reverse direction\n",
    "        if elevator.floor() is 0 or  elevator.floor() is building.height():\n",
    "            elevator.going_up = not elevator.going_up\n",
    "            \n",
    "    return \n",
    "\n",
    "def simulation(n_people, n_floors, elevator_capacity):\n",
    "    \n",
    "    #Initialize Objects\n",
    "    building = Building()\n",
    "    elevator = Elevator(max_weight=elevator_capacity)\n",
    "    #Make n_people people with random weights, current_floor's and destinations\n",
    "    people = [Person(random_weight(), random.randint(0, n_floors), random.randint(0, n_floors))\n",
    "             for _ in range(n_people)]\n",
    "    \n",
    "    \n",
    "    return\n",
    "    "
   ]
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   "execution_count": null,
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   "cell_type": "code",
   "execution_count": null,
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   "source": [
    "import scipy.stats as sts\n",
    "import random\n",
    "\n",
    "def random_weight():\n",
    "    '''\n",
    "    Gets the weight of a random US person,\n",
    "    randomly choosing a male or female\n",
    "    Source: https://www.cdc.gov/nchs/fastats/body-measurements.htm\n",
    "    '''\n",
    "    \n",
    "    #If woman\n",
    "    if sts.uniform(0, 1).rvs() <= 0.5202:\n",
    "        return sts.norm(77.3, 15).rvs()\n",
    "    \n",
    "    #If man\n",
    "    else:\n",
    "        return sts.norm(89.7, 15).rvs()\n",
    "\n",
    "class Building():\n",
    "    \n",
    "    def __init__(self, height, n_people, elevator_capacity):\n",
    "        '''\n",
    "        Building has a height, measured in number of floors\n",
    "        '''\n",
    "        \n",
    "        self.height = height\n",
    "        self.people = [Person(random_weight(), random.randint(0, n_floors), random.randint(0, n_floors)) for _ in range(n_people)]\n",
    "        self.elevator = Elevator(max_weight=elevator_capacity, buttons_pressed=)\n",
    "        \n",
    "        \n",
    "    def naive_up_and_down(self):\n",
    "        '''\n",
    "        Implementation of the example elevator strategy.\n",
    "        The elevator goes back and forth between bottom floor and top floor of the building\n",
    "        until all people have reached their destination\n",
    "        '''\n",
    "    \n",
    "        #People press the elevator button if it is not already pressed\n",
    "        elevator.buttons_pressed = np.unique([person.destination for person in people])\n",
    "\n",
    "        while people:\n",
    "\n",
    "            if elevator.going_up():\n",
    "                #Next stop in the direction of the elevator\n",
    "                next_stop = min(elevator.buttons_pressed)\n",
    "                print(next_stop)\n",
    "\n",
    "\n",
    "            #If elevator has reached top or bottom floor, reverse direction\n",
    "            if elevator.floor() is 0 or  elevator.floor() is building.height():\n",
    "                elevator.going_up = not elevator.going_up\n",
    "\n",
    "        return \n",
    "\n",
    "        \n",
    "        \n",
    "        \n",
    "class Elevator():\n",
    "\n",
    "    def __init__(self, max_weight, current_weight=0, floor=0,\n",
    "                 buttons_pressed=False, going_up=True, door_open=False):\n",
    "\n",
    "        self.floor = floor\n",
    "        self.max_weight = max_weight\n",
    "        self.current_weight = current_weight\n",
    "        self.buttons_pressed = buttons_pressed\n",
    "        self.going_up = going_up\n",
    "        self.door_open = door_open\n",
    "\n",
    "    def go_up(self, distance=1):\n",
    "        '''\n",
    "        Sends elevator down by #distance floors,\n",
    "        if not arg specified, goes down by 1 floor\n",
    "        '''\n",
    "        assert type(distance) is int, \"Distance must be an integer!\"\n",
    "        self.position += distance\n",
    "\n",
    "    def go_down(self, distance=1):\n",
    "        '''\n",
    "        Sends elevator down by #distance floors,\n",
    "        if not arg specified, goes down by 1 floor\n",
    "        '''\n",
    "        assert type(distance) is int, \"Distance must be an integer!\"\n",
    "        self.position -= distance\n",
    "\n",
    "    def go_to(self, floor):\n",
    "        '''\n",
    "        Takes floor as input,\n",
    "        Moves elevator to floor\n",
    "        '''\n",
    "        assert type(floor) is int, \"Distance must be an integer!\"\n",
    "        self.position = floor\n",
    "\n",
    "    def open_door(self):\n",
    "        self.door_open = 0\n",
    "\n",
    "    def close_door(self):\n",
    "        self.door_open = 1\n",
    "\n",
    "\n",
    "class Person():\n",
    "\n",
    "    def __init__(self, weight, current_floor, destination, in_elevator=False):\n",
    "        \n",
    "        self.weight = weight\n",
    "        self.current_floor = current_floor\n",
    "        self.destination = destination\n",
    "        self.in_elevator = in_elevator\n",
    "\n",
    "    def enter_elevator(self):\n",
    "        self.in_elevator = True\n",
    "\n",
    "    def exit_elevator(self):\n",
    "        self.in_elevator = False\n",
    "\n",
    "    def is_going_up(self):\n",
    "        if desination > current_floor:\n",
    "            return 1\n",
    "        elif destination - current_floor > 0:\n",
    "            return -1\n",
    "        else:\n",
    "            return 0\n"
   ]
  }
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