Search found 6 matches

by danarwed
Tue May 31, 2011 1:09 pm
Forum: Other questions
Topic: Order of accuracy for an active cylinder solved with CN
Replies: 3
Views: 2667

Order of accuracy for an active cylinder solved with CN

Hi Ted, thanks for your fast reply (as always!). Let me figure out that I started with nseg=3 and dt=0.01 ms and then successively refined the time steps size, dt -> dt/3 while increasing nseg by 3, nseg -> nseg*3, and these are the results I got: //tend nseg dt soma.v(0.5) at t=10ms a) 10 1 0.01 -9...
by danarwed
Tue May 31, 2011 8:19 am
Forum: Other questions
Topic: Order of accuracy for an active cylinder solved with CN
Replies: 3
Views: 2667

Order of accuracy for an active cylinder solved with CN

Dear Neuroners, I try to solve an active model on a uniform cylinder and investigate the order of convergence one can achieve with the Crank-Nicolson method (CN). The channels in the active model are the classical Hodgkin-Huxley channels from the giant quid axon, but rescaled so as to have the resti...
by danarwed
Fri Jan 15, 2010 9:38 am
Forum: Other questions
Topic: Alpha-Synapse evaluation time in Backward Euler scheme
Replies: 1
Views: 3845

Alpha-Synapse evaluation time in Backward Euler scheme

Dear Neuron-Experts, I have a simple passive model (see the attached code below) consisting of a uniform cylinder with a alpha synapse located in the middle of the cyliner (therefore using an odd number of nseg). The synapse is activated after 1ms with a duration of 1 ms. I try to solve the model wi...
by danarwed
Mon Jan 11, 2010 7:18 am
Forum: Other questions
Topic: Check/Output (discretizsation) matrix
Replies: 4
Views: 2156

Re: Check/Output (discretizsation) matrix

Hello Ted,

I had a look in the source code and found 'nnr_print_matrix' and similar functions (spFileMatrix).
After compiling Neuron with 'nrn_print_matrix' in the solve functions I can have a look at the questioned
matrix.

Anyway thanks for your hints above.
Best regards,
Dan
by danarwed
Mon Jan 11, 2010 5:30 am
Forum: Other questions
Topic: Check/Output (discretizsation) matrix
Replies: 4
Views: 2156

Re: Check/Output (discretizsation) matrix

Dear ted, thank you for your fast reply. Of course, I agree with your statement The model consists of a ladder network of perfect capacitors that are connected at their ungrounded ends by axial resistors. At t = 0, all capacitors are initialized to the same potential. Before the synaptic conductance...
by danarwed
Fri Jan 08, 2010 10:41 am
Forum: Other questions
Topic: Check/Output (discretizsation) matrix
Replies: 4
Views: 2156

Check/Output (discretizsation) matrix

Hello dear forum users, is there any possibility to check or print the matrix which is assembled when solving a model with implicit time integration methods (CN, BE)? I know the Matrix class, which has a print method, but I am not sure whether this datatype is used for matrices evolving in implicit ...