I will leave it to the SynapseCollection experts to answer your questions about SC-details.
But your question made me wonder if you are building your network from an explicitly specified connectome, i.e., a table with one row per connection, specifying source, target, weight and delay. In that case, our new feature to build connections
directly from NumPy arrays may be useful for you (and fast). It is still under review, but you can find it at
I am transitioning my Code from nest 2 to nest 3.
In nest 2 I used a list of connections and could use this list with nest.Get/SetStatus().
With nest 3 I now have a list of SynapseCollections instances, where each synapse collection contains only one connection. For node collections, there seems to be an operator to create a composite (https://nest-simulator.readthedocs.io/en/latest/guides/from_nest2_to_nest3.html#composing
For SynapseCollections, however, I was unable to use the plus operator and could not find similar documentation as in the transition guide. My current workaround is to loop over each instance the list and call Set() on each instance/synapse. What is the recommended
way to create a SynapseCollections from many?
Is there somewhere more documentation covering nest 3 than the two pages covering the changes form nest 2 to 3?
Benedikt S. Vogler
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