Re: [Pcsim-users] plot

[Pecevski D. <de...@ig...>]

Mathieu Dubois wrote:
> Hi,
>
> I would like to plot the networks created with pcsim (with Gnuplot.py).
>
> I know how to access the neurons (in fact the sub-populations created  
> with SpatialSimObjectPopulation) but I don't know how to access the 
> synapses in the network.
>   
The neurons and synapses are treated the same in pcsim, they are both 
inherited from SimObject base class.
If you use populations and projections to construct your model, then

syn_handle = projection_handle.object(i)

gives you the python handle of the synapse with index i in the projection.
To access the synapses and presynaptic and postsynaptic neurons of 
synapses you must construct the projection by
setting the arguments collectIDs and collectPairs to true in the 
constructor, e.g.:

----------

n_exz_syn_project = ConnectionsProjection( exz_nrn_popul, all_nrn_popul, 
                                            StaticSpikingSynapse( W=Wexc, tau=5e-3, delay=1e-3 ),                                               
                                            RandomConnections( conn_prob = ConnP ), 
                                            SimpleAllToAllWiringMethod(net),
                                            collectIDs = True, collectPairs = True )
-------


> Furthermore how can I find the source and the destination of a synapse?
>   

With

pre_post_pair  = projection_handle.prePostPair(i)

you can get the tuple with the id-s of the presynaptic and postsynaptic 
neurons the synapse connects.

You can access these neurons with

net.object(pre_post_pair[0])

etc.

cheers,
Dejan
> Thanks in advance,
> Mathieu
>
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