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The message seems to indicate that you have to build the cell outside of a template to be able to import it. Exactly so. The CellBuilder can only import a cell whose sections are "top- level" (i.e. not encapsulated in an object). Just peel away the "boilerplate" statements that ...

Good point, Raj. The field at the bottom of the "save file" tool is only a "filter field" i.e. it allows you to restrict the kinds of files that are displayed (*.ses will show only ses files, *.* will show all files in a directory). The field at the top of the save file tool is w...

Once you write code in NMODL can you use the graphical interface to see what you have created? Yes. Compile the NMODL file, then run NEURON with that directory as the working directory. The new mechanism will automatically appear in all tools that are used to manage distributed mechanisms and point...

Under WinXP, ordinary users do not have write permission in c:\

The error message means that NMODL doesn't know anything about Na. The reserved symbol for sodium is na. Unless there is a very good reason to "invent" a "new" ionic species, the mod file should declare USEION na READ ena WRITE ina If you decide that it is absolutely necessary to...

If you insert the extracellular mechanism, you can get total membrane current from its i_membrane. However, that includes capacitive current. If you only want ionic currents, you must add them up yourself. The most efficient way to do that is to use Vector record() to capture each ionic current duri...

Also, when I'm compiling I always get this error: Dunno about this one. Given what we know about the aforementioned hoc file, my suspicion is that the mod file is at fault--but can't be sure without seeing it. If you email it to me ted dot carnevale at yale dot edu then I can have an informed opini...

dlopen("libjvm.so") failed: libjvm.so: cannot open shared object file: No such file or directory JNI_CreateJavaVM returned -1 Info: optional feature Java VM is not present. This is meaningless unless you are one of the handful of people who are using Java with NEURON. oc>/usr/local/nrn/i6...

How to import into the CellBuilder is described in the CellBuilder tutorial that you will find on NEURON's Documentation WWW page http://www.neuron.yale.edu/neuron/docs Caveats: Import into the CellBuilder gets topology and 3D information, but does NOT get stylized (L, diam) specification of geometr...

The mod file uses a STATE called j. When this mod file is translated to C, the symbol j0 is automatically generated (for every user-declared STATE x, the NMODL translator generates a corresponding initial condition variable called x0). This conflicts with a predefined symbol j0 (j0 is reserved for o...

Identifying the cause of the problem requires examination of the NMODL
code. If regard it as proprietary, or if it is more than ~30 lines long,
you may email it to me at
ted dot carnevale at yale dot edu
if you wish me to examine it.

Raj wrote:As long as they are switched on and off synchronously

That isn't to say that their current pulses must turn on and off at the same
time. Offhand I can't imagine a situation in which it would be useful to _not_
set up their parameters and events in a single procedure.

Raj is correct about the cause of the problem and the clue to a workaround. But you know how many stim you need to configure, what params you want them to have, and the times at which you want to stuff events, so why not do all this at one time? Change proc initi() so that it iterates over all of th...

Separate model specification from state restoration. The code that recreates the model must be executed before the code that restores states. One way to ensure that this happens is to use an init.hoc file that contains a sequence of load_file() statements that first recreate the model, and then as i...

The Vector class's play() method can be used to drive any variable with an arbitrary waveform. Read about it http://www.neuron.yale.edu/neuron/static/docs/help/neuron/general/classes/vector/vect.html#play Also see this item SEClamp and IClamp just deliver rectangular step waveforms. How can I make t...