www.neuron.yale.edu

fscan is a function used for a single file opened with the ropen function (File.ropen is different).

If you are instead using the File class, then you'll want the scanvar method instead.

Random123 is a high-quality PRNG available from Python/HOC/NMODL in NEURON. It has the additional advantage of providing a large number of independent random streams parameterized by 3 numbers; this is extremely convenient for creating reproducible randomness that works in a parallel computing envi...

1. Point models are fine. If you want biophysical kinetics, just use a section with nseg=1. If you want something more like an integrate-and-fire type cell, use one of the built-in types (e.g. IntFire, IntFire2, IntFire4), find one on ModelDB, or create your own with a MOD file of type ARTIFICIAL_CE...

Dereference a NEURON pointer using [0]. e.g.
This also works in C/C++; the way to think of it is that referring to an array is the same as referring to a block of memory.

Zsh has two things that are roughly equivalent to .bashrc (and .bash_profile): .zshrc and .zshenv (both of these files go in your home folder; they may or may not already be there). .zshrc is only used by interactive shells, and .zshenv is used by all shells, interactive or not. Thus you probably wa...

Without looking closely at this or directly answering your question, my immediate thought is to wonder if lm_callback gets a meaningful value of y? You can avoid doing callbacks at every time step (and thus have a faster simulation) by using a StateTransitionEvent to do an action whenever a variable...

For (1): That's a statement about the variable step solver and does not directly apply to using the fixed step solver. However: above the example, there's also a statement about the fixed step solver, which LinearMechanism forces to use a matrix solver by Kundert (because adding arbitrary equations...

There are two ways to define 3D points. The more object-oriented way is to use sections, e.g. soma.pt3dadd(x, y, z, d) Unfortunately, that way requires numbers for the arguments. The older (and, apparently, more flexible in that it supports Vectors) way uses h and requires a sec= argument; in partic...

You can also do this using the LinearMechanism class. LinearMechanism solves vector ODEs of the form: c y' + gy = b In particular, let's consider the simple firing rate model: tau * y' + decay * y = f(I(t)) For this example, we suppose that I(t) and hence f(I(t)) are known in advance; this allows us...

Okay, so the fundamental situation is as follows: dend00 and dend11 both have the pump as defined by a mod file: dend00.insert('pump') ... dend11.insert('pump') This means that x and the pump dynamics must exist in both of these sections. cyt is defined only on dend00: cyt = rxd.Region(dend00, name=...

I made a quick attempt to reproduce this, but was unsuccessful (in the sense that no mass was created). Can you compare your version to mine and tell me how we differ? from neuron import h, rxd from neuron.units import mV, ms h.load_file('stdrun.hoc') soma = h.Section(name='soma') dend0 = h.Section(...

CVode is an adaptive algorithm that chooses time steps to give results within a specified error tolerance . Thus it will use small timesteps when things are changing rapidly (e.g. synaptic input, during an action potential) and larger timesteps where they are not. To get the same accuracy out of fix...

I suspect if you look at t, v, etc, you would find that they're lists of Vectors (or maybe but probably not strings), whereas the code you found on the NEURON site assumes them to be lists/vectors of floats. i.e. what is returned in t_, v_, etc is likely Vectors showing the full time course of the v...

There's also a HOC version of the programmer's reference at: https://www.neuron.yale.edu/neuron/stat ... index.html

That's very weird because there's nothing wrong with h('{sw4=new PlotShape(0)}') by itself. There's no way there's a weird character in there, is there? (Non-breaking space, that sort of thing?) Otherwise, my guess is that something badly destabilized NEURON before you got that far. If you're willin...