Dear Jasper,
In NEST 3, this should be possible.
Stine or Håkon, could you provide some advice?
Best, Hans Ekkehard
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Prof. Dr. Hans Ekkehard Plesser Head, Department of Data Science
Faculty of Science and Technology Norwegian University of Life Sciences PO Box 5003, 1432 Aas, Norway
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On 06/04/2021, 12:05, "Albers, Jasper" <j.albers@fz-juelich.demailto:j.albers@fz-juelich.de> wrote:
Dear all,
a colleague of mine (in CC) and myself are implementing a spatially structured network in NEST (using current NEST master). We are wondering how to generate a population of neurons that are distributed on a regular grid plus a random jitter. This means that we want to end up with a spatial distribution as can be seen in Figure 8 in the tutorial for creating spatially structured networkshttps://nest-simulator.readthedocs.io/en/latest/tutorials/pynest_tutorial/part_4_spatially_structured_networks.html?highlight=jitter#defining-spatially-distributed-nodes. Below that figure one finds a code snippet; however, we believe that this does not correspond to the distribution of Figure 8. In the documentation of NEST 2.20.1 we did find a code snippet that produces a jittered grid:
import numpy as np
# grid with jitter
jit = 0.03
xs = np.arange(-0.5,.501,0.1)
poss = [[x,y] for y in xs for x in xs]
poss = [[p[0]+np.random.uniform(-jit,jit),p[1]+np.random.uniform(-jit,jit)] for p in poss]
layer_dict_ex = {"positions": poss,
"extent" : [1.1,1.1],
"elements" : "iaf_psc_alpha"}
As is apparent, this code does not make use of NEST internal random number generation but rather produces a list of positions that is then passed to a layer. Thus our question is: is it possible to create a jittered grid natively in NEST master?
Best regards, Jasper and Anno
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