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A terminal window does open but does not offer a prompt for commands: <stdin>:149: SyntaxWarning: invalid escape sequence '\.' <stdin>:197: SyntaxWarning: invalid escape sequence '\.' Attempt to fix nrniv failure using: eval "`mk_nrnpyenv.sh`" failed. can't open DISPLAY nrngui exit status ...

I had some success from the Mac terminal by setting the DISPLAY env var: export DISPLAY=:0 That enables me to run nrngui and neurondemo from the terminal when the XQuartz app is running. It does not enable me to launch the .app versions through the OS GUI. Note that the default value of DISPLAY was ...

Yes, I can start nrngui from an Xquartz terminal (started from the Xquartz app menu). I hadn't tried this correctly before because, for some reason, I was always typing "nrniv" from the command line in both the Xquartz terminal and Mac terminal. But either way, nrngui does not work for me ...

On my end, no luck yet after reinstalling Xquartz. The latest version is from January 2023 (same version that I already had installed), but I uninstalled/reinsntalled and still get the same error with xeyes. There are several threads out there on this kind of Xquartz error, but I haven't found any t...

Ah, there's a clue. Doesn't work from Mac terminal, giving the following error:

Error: Can't open display: /private/tmp/com.apple.launchd.twr4Ugscqx/org.xquartz:0

But it does work from within an Xquartz terminal. I guess I'll try updating/reinstalling Xquartz next.

Thanks, but unfortunately it didn't work. Using Mac terminal, I still get the same error. Opening nrngui.app through Applications/NEURON produces this version of the error: <stdin>:149: SyntaxWarning: invalid escape sequence '\.' <stdin>:197: SyntaxWarning: invalid escape sequence '\.' Attempt to fi...

I recently installed NEURON on a new computer and am trying to run nrniv, but get the error "can't open DISPLAY". If I run it from an XQuartz terminal, I get an "oc" prompt but no GUI. Environment details are: Mac M2 with Sonoma 14.0, XQuartz 2.8.5, installed NEURON via pip3. Typ...

Thanks for explaining.

Is the following invalid because 'y' is a reserved word? NEURON { SUFFIX test5 } STATE { y } BREAKPOINT { SOLVE states METHOD derivimplicit } INITIAL { y = 10.0 } DERIVATIVE states { y' = 0 } I get the following compilation error: test5.c:109:16: error: redefinition of 'y0' as different kind of symb...

Very minor typo in the tutorial "Scripting NEURON basics": https://neuron.yale.edu/neuron/docs/scripting-neuron-basics After the section named "Step 8: Plot the results", we find "Step 8: Saving and loading results". It appears the last section should be "Step 9&qu...

Thanks, Ted! Yes, your version is very faithful to my original. Thanks for taking the time to tweak the logistic parameters and make them work with the original parameters for 'b'. Much nicer than my rough demo.

There's an outdated link in the MacOS installation tips (https://neuron.yale.edu/neuron/download). This is under "Troubleshooting the macOS installer", "Problem: No gui when NEURONDEMO is launched." The link for XDarwin appears to be undesirable. For me, it redirects to a lovely ...

Thanks, Ted! Yes, the squashing function does the trick to enable variable time step. As you pointed out, it's awkward because things must be tailored just right. As a proof of concept, I flipped the sign on the driving force (+b) and scaled it considerably (b0 = 100). For example: NEURON { POINT_PR...

Ted, if it helps, I'll try to condense me questions and recent reply. The questions are: 1. Assuming a hard if-then reset is absolutely necessary, is the best practice to generally ensure the integrator is using fixed time-step? And if so, is it reasonable to use an if statement in the BREAKPOINT bl...

Yes, and yes. It's a somewhat arbitrary test of enforcing boundary limits on a state variable. The variable 'a' could possibly mimic the average firing rate of a neuronal population driven by some other input. In that interpretation, the firing rate should never be negative.