NEST Users April 2021

users@nest-simulator.org

11 participants
15 discussions

Data Science Morning Coffee
by Hans Ekkehard Plesser 12 Apr '21

12 Apr '21

Dear all! Here the morning coffees are back in Outlook. We meet at https://nmbu.zoom.us/j/940209461. Best, Hans Ekkehard

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Canceled: Data Science Morning Coffee
by Hans Ekkehard Plesser 12 Apr '21

12 Apr '21

Dear all! Here the morning coffees are back in Outlook. We meet at https://nmbu.zoom.us/j/940209461. Best, Hans Ekkehard

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Canceled: Data Science Morning Coffee
by Hans Ekkehard Plesser 12 Apr '21

12 Apr '21

Dear all! Here the morning coffees are back in Outlook. We meet at https://nmbu.zoom.us/j/940209461. Best, Hans Ekkehard

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Re: Spatial grid + jitter
by Hans Ekkehard Plesser 07 Apr '21

07 Apr '21

Dear Jasper, In NEST 3, this should be possible. Stine or Håkon, could you provide some advice? Best, Hans Ekkehard -- 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 Phone +47 6723 1560 Email hans.ekkehard.plesser(a)nmbu.no<mailto:hans.ekkehard.plesser@nmbu.no> Home http://arken.nmbu.no/~plesser On 06/04/2021, 12:05, "Albers, Jasper" <j.albers(a)fz-juelich.de<mailto: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 networks<https://nest-simulator.readthedocs.io/en/latest/tutorials/pynest_tutorial/p…>. 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 ------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------ Forschungszentrum Juelich GmbH 52425 Juelich Sitz der Gesellschaft: Juelich Eingetragen im Handelsregister des Amtsgerichts Dueren Nr. HR B 3498 Vorsitzender des Aufsichtsrats: MinDir Volker Rieke Geschaeftsfuehrung: Prof. Dr.-Ing. Wolfgang Marquardt (Vorsitzender), Karsten Beneke (stellv. Vorsitzender), Prof. Dr.-Ing. Harald Bolt, Prof. Dr. Frauke Melchior ------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------

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Spatial grid + jitter
by Albers, Jasper 06 Apr '21

06 Apr '21

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 networks<https://nest-simulator.readthedocs.io/en/latest/tutorials/pynest_tutorial/p…>. 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 ------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------ Forschungszentrum Juelich GmbH 52425 Juelich Sitz der Gesellschaft: Juelich Eingetragen im Handelsregister des Amtsgerichts Dueren Nr. HR B 3498 Vorsitzender des Aufsichtsrats: MinDir Volker Rieke Geschaeftsfuehrung: Prof. Dr.-Ing. Wolfgang Marquardt (Vorsitzender), Karsten Beneke (stellv. Vorsitzender), Prof. Dr.-Ing. Harald Bolt, Prof. Dr. Frauke Melchior ------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------

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