import nest

nest.ResetKernel()

E = nest.Create('aeif_cond_exp',2)

I = nest.Create('aeif_cond_exp',2)

nest.Connect(E,I)

for c in nest.GetConnections():

print(c,c.source)

print(nest.NodeCollection([c.source]).get()) # information about the node

print(c.get()) # information about the connection

You raise an interesting point though, we have iterators for the sources and targets (nest.GetConnections().sources() / nest.GetConnections().targets()) that returns an iterator that iterates over the source and target node ids. Thinking about it now, these iterators should probably return a NodeCollection instead. Then, it would be easy to inspect the source and target nodes. The node id's can still be extracted with nest.GetConnections().source as you have said. I have created an issue on this where we can discuss further: https://github.com/nest/nest-simulator/issues/2204.

Best wishes,

Stine

From: Maryada Maryada <er.maryada@gmail.com>
Sent: Monday, November 8, 2021 12:33
To: NEST User Mailing List <users@nest-simulator.org>
Subject: [NEST Users] Re: Get details of source and target from Connection list

Hi Stine,

This is exactly what I am trying to do, see the code below

import nest
nest.ResetKernel()
E = nest.Create('aeif_cond_exp',2)
I = nest.Create('aeif_cond_exp',2)
nest.Connect(E,I)
for c in nest.GetConnections():
print(c,c.source)
print(nest.GetStatus(c.source))

I just thought it would be an unnecessary step to then convert c.source to a NodeCollection unless that is the only right way of getting the information of source node.

On Mon, Nov 8, 2021 at 10:50 AM Stine Brekke Vennemo <stine.brekke.vennemo@nmbu.no> wrote:

Dear Maryada,

Unfortunately, I was not able to open your attachment, so I could not have a look at your code. It is possible to convert a neuron id to a NodeCollection and then get the information by calling

nc = nest.NodeCollection([neuron_id])

nc.get()

nest.GetStatus(nc) also works. Instead of the single neuron id in the list, you could also send several neuron id's.

This will not get you any information about the connections however. If this is what you are after, you need to get the SynapseCollection by calling nest.GetConnections(), and then either iterating the SynapseCollection and get the information for the individual connection or get the information for the entire connection.

Hope this helps!

Best wishes,

Stine

From: Maryada Maryada <er.maryada@gmail.com>
Sent: Thursday, November 4, 2021 15:24
To: NEST User Mailing List <users@nest-simulator.org>
Subject: [NEST Users] Get details of source and target from Connection list

Dear NEST users,

In the past version, for debugging purposes I used to get information of my source and target using the GetStatus function.

However, with NEST 3.0, I couldn't find a way to do so, mainly because I have to pass either a SynpaseCollection or NeuronCollection as a function argument to GetStatus. Is it possible to fetch node collection from neuron id? Or any easier way to get source and target properties.

I referred document at link https://nest-simulator.readthedocs.io/en/v3.1/guides/connection_management.html?highlight=getstatus#inspecting-connections

I have attached the python file for the same.

--

Thanks,

Maryada

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Thanks and Regards

Maryada