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Thanks very much for your very helpful reply Ted. I've tried responding to all your queries, but I've run out of time today, so the later ones aren't addressed very well. Strange results indeed. Do you get similar results if you simply forall nseg*=3 a few times? It does vary a bit, though it looks ...

I have a somewhat complicated hoc object that allows you to place point processes with a probability that depends on the diameter and length of the segment within a section, and of the perpendicular distance of the segment to some plane, which could be the cell body layer. Please let me know if you'...

I am trying to measure the propagation speed in the myelinated axon model of McIntyre et al. (2002, http://senselab.med.yale.edu/ModelDb/showmodel.asp?model=3810). I'm measuring the propagation speed by detecting the time the membrane potential passes -40mV using an APcount point process (code can b...

Hello Mike & Ted, Thanks for the -- as ever -- speedy fix to this problem and thanks too for the point about the units. I've been forgetting to run modlunit recently... I've pulled the development version from the subversion repository, and it seems to be working fine so far. All the best, David.

Hello all, I can compile the appendend NMODL file (which is meant to simulate the development of the neuromuscular junction), but when I come to run nrngui, I get the following error: loading membrane mechanisms from /home/sterratt/projects/nmj/neuron/i686/.libs/libnrnmech.so Additional mechanisms f...

Following Raj's helpful suggestions, I've updated the emacs hoc mode.

Hello all, Andrew Gillies and I have created a simple network simulation using the MPI features of Neuron 5.9. It models the highly biologically-relevant case of a network of squid axons connected by excitatory synapses (cough). The reason we wrote it was that we needed a script to benchmark the per...

Hello syntax highlighters of an emacs persuasion, it was suggested to me that I post my new nmodl mode for emacs here as well as in the announcements forum. http://www.anc.ed.ac.uk/~dcs/progs/neuron/ Any suggestions or edits to the code would be welcome. The list of highligted words almost certainly...

Hello Neuron users who edit with emacs

I've written a basic nmodl mode for mod files. It's based on the nrnhoc mode I released some time ago. Downloads and installation instructions for both modes are at:

http://www.anc.ed.ac.uk/~dcs/progs/neuron/

All the best,

David.

Hello all, I was hoping to use NEURON for some very simple demos of integrate and fire neurons. One demo I'd like to do is an f-I curve of an IF neuron with an absolute refractory period. IntFire1 has an absolute refractory period, but no bias current. IntFire2 has bias current but no absolute refra...

Thanks in advance for the fix and thanks for the explanation Mike -- I now understand a bit more about the numerical solution methods in NEURON. Just to check I've understood it right, when the fix has been applied, the diagaonal element of the Jacobian corresponding to <code> V' = (alphav * sigm(ca...

Excellent question, David, and thoughtful dissection of the intermediate files, Raj. What happened here is a result of the fact that "cnexp is limited to linear equations that are very easy to parse" (to quote an old email from Michael Hines). After all, it was intended for use with HH-st...

I'm getting the following (cryptic) error when compiling the following nmodl file: ~/datastore/nrn-5.8/i686/bin/nrnivmodl "/home/sterratt/datastore/nrn-5.8/i686/bin/nocmodl" psd Translating psd.mod into psd.c nocmodl: diffeq.y:194: difeq_yyerror: Assertion `0' failed. make: *** [psd.lo] Ab...