.. currentmodule:: brian

.. index::
   pair: example usage; NeuronGroup
   pair: example usage; run
   pair: example usage; SpikeCounter

.. _example-misc_I-F_curve2:

Example: I-F_curve2 (misc)
==========================

Input-Frequency curve of a IF model
Network: 1000 unconnected integrate-and-fire neurons (leaky IF)
with an input parameter v0.
The input is set differently for each neuron.
Spikes are sent to a spike counter (counts the spikes emitted by each neuron).

::

    from brian import *
    
    N = 1000
    tau = 10 * ms
    eqs = '''
    dv/dt=(v0-v)/tau : volt
    v0 : volt
    '''
    group = NeuronGroup(N, model=eqs, threshold=10 * mV, reset=0 * mV, refractory=5 * ms)
    group.v = 0 * mV
    group.v0 = linspace(0 * mV, 20 * mV, N)
    
    counter = SpikeCounter(group)
    
    duration = 5 * second
    run(duration)
    plot(group.v0 / mV, counter.count / duration)
    show()