.. currentmodule:: brian

.. index::
   pair: example usage; MultiStateMonitor
   pair: example usage; run
   pair: example usage; sin
   pair: example usage; TimedArray
   pair: example usage; NeuronGroup

.. _example-misc_timed_array:

Example: timed_array (misc)
===========================

An example of the :class:`TimedArray` class used for applying input currents
to neurons.

::

    from brian import *
    
    N = 5
    duration = 100 * ms
    Vr = -60 * mV
    Vt = -50 * mV
    tau = 10 * ms
    Rmin = 1 * Mohm
    Rmax = 10 * Mohm
    freq = 50 * Hz
    k = 10 * nA
    
    eqs = '''
    dV/dt = (-(V-Vr)+R*I)/tau : volt
    R : ohm
    I : amp
    '''
    
    G = NeuronGroup(N, eqs, reset='V=Vr', threshold='V>Vt')
    G.R = linspace(Rmin, Rmax, N)
    
    t = linspace(0 * second, duration, int(duration / defaultclock.dt))
    I = clip(k * sin(2 * pi * freq * t), 0, Inf)
    G.I = TimedArray(I)
    
    M = MultiStateMonitor(G, record=True)
    
    run(duration)
    
    subplot(211)
    M['I'].plot()
    ylabel('I (amp)')
    subplot(212)
    M['V'].plot()
    ylabel('V (volt)')
    show()