Sketch of agent-based model in Julia.ipynb

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     "data": {
      "text/plain": [
       "move! (generic function with 2 methods)"
      ]
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     "execution_count": 8,
     "metadata": {},
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   "source": [
    "abstract Person\n",
    "\n",
    "type Adult <: Person\n",
    "    age::Int\n",
    "    height::Float64\n",
    "    position::Int\n",
    "end\n",
    "\n",
    "type Child <: Person\n",
    "    age::Int\n",
    "    height::Float64\n",
    "    position::Int\n",
    "    at_school::Bool\n",
    "end\n",
    "\n",
    "type Bad <: Person\n",
    "    age::Int\n",
    "end\n",
    "\n",
    "function move!(p::Person)\n",
    "    p.position += 1\n",
    "end\n",
    "\n",
    "function move!(c::Child)\n",
    "    c.position += 1\n",
    "    c.at_school = !c.at_school\n",
    "end"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {
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   "outputs": [
    {
     "data": {
      "text/plain": [
       "Adult(3,4.0,5)"
      ]
     },
     "execution_count": 3,
     "metadata": {},
     "output_type": "execute_result"
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   ],
   "source": [
    "a = Adult(3, 4, 5)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "6"
      ]
     },
     "execution_count": 4,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "move!(a)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {
    "collapsed": false
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   "outputs": [
    {
     "data": {
      "text/plain": [
       "Child(3,4.0,5,true)"
      ]
     },
     "execution_count": 6,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "c = Child(3, 4, 5, true)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 9,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "false"
      ]
     },
     "execution_count": 9,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "move!(c)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 10,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "Bad(3)"
      ]
     },
     "execution_count": 10,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "b = Bad(3)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 11,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "ename": "LoadError",
     "evalue": "type Bad has no field position\nwhile loading In[11], in expression starting on line 1",
     "output_type": "error",
     "traceback": [
      "type Bad has no field position\nwhile loading In[11], in expression starting on line 1",
      "",
      " in move! at In[8]:21"
     ]
    }
   ],
   "source": [
    "move!(b)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
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    "collapsed": true
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   "outputs": [],
   "source": []
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