spike-train-with-no-length.ipynb

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   "execution_count": 1,
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   "source": [
    "import numpy as np\n",
    "from quantities import mV,s\n",
    "from elephant.spike_train_generation import threshold_detection\n",
    "from neo.core import AnalogSignal,SpikeTrain"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "train1 = SpikeTrain([],t_stop=1,units=s) # An empty spike train.  "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
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   "outputs": [
    {
     "data": {
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      ]
     },
     "execution_count": 3,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "len(train1) # This has zero length.  "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {
    "collapsed": false
   },
   "outputs": [],
   "source": [
    "vm = AnalogSignal(np.ones(1000)*-60*mV,sampling_period=0.001*s) # -60 mV throughout.  "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {
    "collapsed": false
   },
   "outputs": [],
   "source": [
    "train2 = threshold_detection(vm) # SpikeTrain instance extracted from voltage trace.  "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "ename": "TypeError",
     "evalue": "len() of unsized object",
     "output_type": "error",
     "traceback": [
      "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[0;31mTypeError\u001b[0m                                 Traceback (most recent call last)",
      "\u001b[0;32m<ipython-input-6-56e7acd95d3e>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m()\u001b[0m\n\u001b[0;32m----> 1\u001b[0;31m \u001b[0mlen\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mtrain2\u001b[0m\u001b[0;34m)\u001b[0m \u001b[0;31m# This has undefined length, despite being a SpikeTrain.\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m",
      "\u001b[0;31mTypeError\u001b[0m: len() of unsized object"
     ]
    }
   ],
   "source": [
    "len(train2) # This has undefined length, despite being a SpikeTrain.  "
   ]
  }
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