Search found 1608 matches

by hines
Mon Jan 25, 2021 4:42 pm
Forum: MSWin
Topic: Issues with Anaconda install
Replies: 2
Views: 150

Re: Issues with Anaconda install

From a terminal which can run the specific conda environment, do you have a PYTHOPATH that mentions c:\nrn\lib\python ? If you launch python (in your specific conda environment and without such a PYTHONPATH) can you import sys sys.path.append("c:/nrn/lib/python") import neuron neuron.test(...
by hines
Thu Jan 21, 2021 10:28 am
Forum: Parallel NEURON
Topic: Efficient way of debugging Python scripts with MPI library
Replies: 4
Views: 138

Re: Efficient way of debugging Python scripts with MPI library

I was accessing a cell that is not associated with the rank it was made This wording puzzles me as I don't know anyway for a cell not to be associated with the rank it was made on. (although if you are using multisplit there may be parts of a cell that are on ranks that are different from the rank ...
by hines
Mon Nov 23, 2020 6:53 am
Forum: Getting started
Topic: Display environment error
Replies: 2
Views: 275

Re: Display environment error

XQuartz is one of those installations that requires one to logout and log back in in order to activate it.
by hines
Mon Nov 23, 2020 6:50 am
Forum: Getting started
Topic: Compiling Mod Files on Catalina
Replies: 8
Views: 668

Re: Compiling Mod Files on Catalina

A work around for now for readline problems is to try
nrn-7.8.1-2-gdfe33e60-osx-27-36-37-38-39.pkg
or
nrn-8.0.dev-239-g8f2aaaa9.w64-mingw-py-27-36-37-38-39-setup.exe
at
https://neuron.yale.edu/ftp/neuron/versions/alpha/
These use NEURON's internal readline sources.
by hines
Sat Nov 21, 2020 11:52 am
Forum: Getting started
Topic: Compiling Mod Files on Catalina
Replies: 8
Views: 668

Re: Compiling Mod Files on Catalina

Because of these perennial problems with readline when binary distributions are installed, we will be taking the tack during build of compiling a recent version of readline ourselves as a libreadline.a file along with ncurses and incorporating that into the libnrniv.dylib. I hope after that I'll nev...
by hines
Wed Nov 11, 2020 6:34 pm
Forum: MSWin
Topic: Compiling script fails with newer NEURON versions due to $N
Replies: 6
Views: 2318

Re: Compiling script fails with newer NEURON versions due to $N

Please try https://neuron.yale.edu/ftp/neuron/vers ... -setup.exe
If there are any difficulties that is the best place for me to resolve. I'm not experiencing any $N issue with that.
by hines
Thu Oct 22, 2020 7:01 pm
Forum: OS X
Topic: Gui Freezing
Replies: 3
Views: 315

Re: Gui Freezing

I would re-install software from xquartz.org. (After installing, logout and log back in). If that does not fix the issue, it may be a good idea to update the xcode command line tools and redo your mod files with nrnivmodl after removing the x86_64 folder. WIth regard to updating the xcode command li...
by hines
Thu Oct 22, 2020 5:25 pm
Forum: UNIX/Linux
Topic: Installing on Ubuntu 20.04 (GUI not working)
Replies: 7
Views: 968

Re: Installing on Ubuntu 20.04 (GUI not working)

The issues mentioned by Ted have been fixed and are available with the current neuron-nightly wheel. Also neurondemo should work when the
neuron-nightly wheel is installed in a location for which the user does not have write permission (eg. sudo pip...).
by hines
Sat Oct 03, 2020 7:05 am
Forum: Other questions
Topic: Temperature Dependent Membrane Capacitance
Replies: 4
Views: 1680

Re: Temperature Dependent Membrane Capacitance

If you are using extracellular, make sure you have that inserted in every node as well as the myelin sections. Otherwise the extracellular current balance boundary conditions may not be as expected.
by hines
Thu Aug 13, 2020 10:56 am
Forum: MSWin
Topic: DLL load failed in Windows10
Replies: 4
Views: 717

Re: DLL load failed in Windows10

File "C:\Users\17186\py3env\Lib\site-packages\neuron\__init__.py", line 90 I'm puzzled by this because on windows 10 the neuron module is in c:\nrn\lib\python\neuron Do you have an old installation from pip install from a third party? It has been a long time since __init__.py had python 2...
by hines
Tue Aug 11, 2020 8:43 am
Forum: Adding new mechanisms and functions to NEURON
Topic: Defining a POINTER to be a list
Replies: 16
Views: 8003

Re: Defining a POINTER to be a list

VERBATIM is still the only way to implement an array of pointers.
by hines
Thu Jul 30, 2020 7:00 am
Forum: Other questions
Topic: initialization of calcium concentration in a segment with attached point process
Replies: 5
Views: 860

Re: initialization of calcium concentration in a segment with attached point process

You probably think this is a bug, I think we need to expand the documentation about ion_style a bit in this area. ie. from neuron.yale.edu/neuron/static/py_doc/modelspec/programmatic/ions.html?highlight=ion_style Warning: if other mechanisms are inserted subsequent to a call of this function, the s...
by hines
Tue Jul 28, 2020 4:47 pm
Forum: NEURON + Python
Topic: Is it possible to track "value explosions" and out of range errors
Replies: 2
Views: 447

Re: Is it possible to track "value explosions" and out of range errors

The exp function is often used for channel rates where the arg is some function of voltage. As the arg is 1.8...e184 that could be far downstream from the cause of such a large arg. Also it sometimes occurs under conditions of temporary instability while the variable time step method is busy reducin...
by hines
Wed Jun 10, 2020 11:07 am
Forum: Other questions
Topic: spFactor error: Zero Diagonal
Replies: 5
Views: 3805

Re: spFactor error: Zero Diagonal

2008, 2012, and now 2020. I wonder what happened in 2016 :) Please send me a zip file with the hoc,ses,mod,py files so I can reproduce the error and try to diagnose. The error message means the matrix had no inverse. I wonder if two matrix rows started out the same. I wonder if the (sub?)problem it ...
by hines
Wed Jun 03, 2020 9:08 am
Forum: UNIX/Linux
Topic: Open MPI error with h.nrnmpi_init(): mca_base_component_repository_open: unable to open mca_patcher_overwrite
Replies: 7
Views: 2529

Re: Open MPI error with h.nrnmpi_init(): mca_base_component_repository_open: unable to open mca_patcher_overwrite

openmpi was not installed "over" the old version That is better. One can safely update or remove the system version with apt and one can safely update your source compiled version without them interfering with each other. From the perspective of a NEURON build, one by default always gets ...