.. currentmodule:: brian

.. index::
   pair: example usage; NeuronGroup
   pair: example usage; run
   pair: example usage; firing_rate
   pair: example usage; raster_plot
   pair: example usage; Connection
   pair: example usage; SpikeMonitor
   pair: example usage; CV

.. _example-misc_minimalexample:

Example: minimalexample (misc)
==============================

Very short example program.

::

    from brian import *
    
    eqs = '''
    dv/dt = (ge+gi-(v+49*mV))/(20*ms) : volt
    dge/dt = -ge/(5*ms) : volt
    dgi/dt = -gi/(10*ms) : volt
    '''
    
    P = NeuronGroup(4000, model=eqs,
                  threshold= -50 * mV, reset= -60 * mV)
    P.v = -60 * mV + 10 * mV * rand(len(P))
    Pe = P.subgroup(3200)
    Pi = P.subgroup(800)
    
    Ce = Connection(Pe, P, 'ge', weight=1.62 * mV, sparseness=0.02)
    Ci = Connection(Pi, P, 'gi', weight= -9 * mV, sparseness=0.02)
    
    M = SpikeMonitor(P)
    
    run(1 * second)
    i = 0
    while len(M[i]) <= 1:
        i += 1
    print "The firing rate of neuron", i, "is", firing_rate(M[i]) * Hz
    print "The coefficient of variation neuron", i, "is", CV(M[i])
    raster_plot(M)
    show()