Search found 70 matches

by Krishna Chaitanya
Mon Jun 06, 2016 12:09 am
Forum: Parallel NEURON
Topic: Number of spikes decrease in parallel run
Replies: 2
Views: 4968

Number of spikes decrease in parallel run

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...
by Krishna Chaitanya
Fri Oct 16, 2015 10:03 pm
Forum: Modeling networks
Topic: Non-repeating random numbers
Replies: 3
Views: 5876

Re: Non-repeating random numbers

Hi Ted,

I am considering integers not floating numbers.

Can you kindly let me know how to generate?
by Krishna Chaitanya
Fri Oct 16, 2015 8:25 am
Forum: Modeling networks
Topic: Non-repeating random numbers
Replies: 3
Views: 5876

Non-repeating random numbers

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.
by Krishna Chaitanya
Mon Oct 12, 2015 4:09 am
Forum: Parallel NEURON
Topic: Connecting cells using pnm.nc_append function
Replies: 1
Views: 5434

Connecting cells using pnm.nc_append function

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...
by Krishna Chaitanya
Fri May 08, 2015 1:47 am
Forum: Modeling networks
Topic: Negative weights at NetCon
Replies: 3
Views: 5802

Re: Negative weights at NetCon

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.
by Krishna Chaitanya
Thu May 07, 2015 4:06 am
Forum: Modeling networks
Topic: Negative weights at NetCon
Replies: 3
Views: 5802

Negative weights at NetCon

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...
by Krishna Chaitanya
Fri Feb 28, 2014 6:19 am
Forum: Modeling networks
Topic: Playing values into a point process
Replies: 1
Views: 5885

Playing values into a point process

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...
by Krishna Chaitanya
Sat Feb 01, 2014 12:50 am
Forum: Modeling networks
Topic: Running multiple neurons through parallel programming
Replies: 1
Views: 5181

Running multiple neurons through parallel programming

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,...
by Krishna Chaitanya
Sat Feb 01, 2014 12:45 am
Forum: Modeling networks
Topic: Multiple spikes at NET_RECEIVE block
Replies: 3
Views: 5365

Re: Multiple spikes at NET_RECEIVE block

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 ...
by Krishna Chaitanya
Wed Jan 29, 2014 3:51 am
Forum: Modeling networks
Topic: Multiple spikes at NET_RECEIVE block
Replies: 3
Views: 5365

Multiple spikes at NET_RECEIVE block

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...
by Krishna Chaitanya
Wed Sep 11, 2013 10:26 pm
Forum: Parallel NEURON
Topic: cvode.use_daspk error
Replies: 3
Views: 5662

Re: cvode.use_daspk error

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...
by Krishna Chaitanya
Tue Sep 10, 2013 10:18 am
Forum: Parallel NEURON
Topic: cvode.use_daspk error
Replies: 3
Views: 5662

cvode.use_daspk error

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(...
by Krishna Chaitanya
Tue Sep 10, 2013 2:22 am
Forum: Parallel NEURON
Topic: restore in session files
Replies: 2
Views: 5269

restore in session files

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...
by Krishna Chaitanya
Thu Sep 05, 2013 9:14 am
Forum: Parallel NEURON
Topic: Assign gids to two different cell types
Replies: 1
Views: 3045

Assign gids to two different cell types

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.
by Krishna Chaitanya
Tue Sep 03, 2013 12:16 am
Forum: Parallel NEURON
Topic: Shape Plot while using parallel context
Replies: 1
Views: 1632

Shape Plot while using parallel context

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.