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Hi, I have tried to compare serial and parallel versions of my network code. In parallel run, as the number of processes increased, the total number of spikes decreased. Let's say, with np 1, total number of spikes observed is 58000 and with np 2, the number of spikes decreased to 38000. In the seri...

Hi Ted,

I am considering integers not floating numbers.

Can you kindly let me know how to generate?

Hi,

Is there a facility in NEURON to generate non-repeating random numbers? I am using random syntax but I don't want to repeat the numbers which already got generated.

Kindly let me know.

Thank you.

Hi, I have two cell types which are point processes. Each of the cell type has certain neurons in the network and the connection I am trying to establish through pnm.nc_append. The spike events from cell type A are not being communicated to cell type B. But when I replace with NetCon statements, eve...

Dear Ted,

I did use negative weights for my Izhikevich mod file which is point process. But the simulation time has increased significantly. Whether I use NONSPECIFIC_CURRENT variable or not, the simulation time takes a very long duration.

Kindly let me know what to do.
Thank you.

Hi, I am trying to give excitatory and inhibitory connections to Izhikevich model. When I create NetCon objects for these connections, how would the model know the incoming connection is excitatory or inhibitory? I tried setting negative weights for inhibitory connections but the simulation slowed d...

Hi, I want set of values which are generated in a similar fashion to that of spike generator (Pregen.mod) to be played into a point process. After that my point process should connect to a synapse and activate that cell. I have generated these set of values in {20,-90} fashion to mimic spike generat...

Hi, I have tried running a fairly large network with cvode solver and also with intrinsic parallelization. For 4000 neurons, the simulation didn't show any error but when scaled to 40000, this error is shown (please see below): exp(944.591) out of range, returning exp(700) exp(944.592) out of range,...

Hi, My presynaptic neuron is a spike generator which delivers 5 spikes spaced at 10 ms interval to post synaptic neuron. And the postsynaptic neuron is point process which receives synaptic events at NET_RECEIVE block. I know that the presynaptic neuron fired through the graph plot window. While my ...

Hi, I have tried connecting presynaptic neuron which has 5 spikes to postsynaptic neuron through NetCon usage. Since it is event related, whenever connection happens, presynaptic neuron NET_RECEIVE block activates. But not all spikes from my presynaptic neuron are delivered. My postsynaptic neuron i...

Hi, The problem now seems to be with cvode.use_daspk(1) after I changed cvode.active(1) to cvode_active(1). 1 /home/krishna/nrn-7.3_installed/x86_64/bin/nrniv: spFactor error: Singular 1 in test_mosinit.hoc near line 102 1 cvode.use_daspk(1) ^ 1 CVode[1].use_daspk(1) application called MPI_Abort(MPI...

Hi, I have tried parallelization of different types of cells by putting them in one for loop and checking with the local variable i whether it has reached the cell count limit. And based upon that it is assigned gids. Now when I use the below lines: cvode=new CVode() cvode.active(1) cvode.use_daspk(...

Hi, I have a doubt with regard to the session files. Inside my saved session file, I find restore(411,2) line. What is the meaning of those numbers as arguments? I searched about this syntax in NEURON programmer's reference but I couldn't get enough information. I could find only restore() or restor...

Hi, How to assign gids to two different cell types? Because, when I use for (i=pc.id; i<$1;i+=pc.nhost), it cannot set same gid for two different cells. Are there any examples available on this type of problem? In my case, two cell types exist: cell_1[3000], cell_2[102] Kindly let me know. Thank you.

Hi,

Is it possible to use shape plot while running parallel code? As far as I know, it's not possible I suppose. But if there is any way to visualize the real time simulation, it would be useful.

Kindly let me know.

Thank you.