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Analytic solution for tapered cable #42

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halfflat opened this issue Oct 27, 2016 · 4 comments
Closed

Analytic solution for tapered cable #42

halfflat opened this issue Oct 27, 2016 · 4 comments
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@halfflat
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Better to use an analytic (series) solution for a tapered cable-only model in validation testing, than asking NEURON to generate data for this case.

  • Do the maths: extended analytic result to tapered (i.e. linearly varying resistance) cable model.
  • Implement the model in e.g. Julia
  • Use this model to generate reference data for a Rallpack1-analagous tapered cable model.
@halfflat halfflat self-assigned this Oct 27, 2016
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halfflat commented Jan 22, 2019 •
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Turns out the maths is a bit hard!

Will come back to this, but for a truncated tapered cable with a current injection at the thick end, the underlying PDE we need to solve is the following, for g(x,t), x ∈ [a, b], t ≥ 0.

x·gxx + 2gx = gt + g,

subject to:

gx(a, t ) = 0, gx(b, t ) = -1 for t > 0,
g(x, 0) = 0.

noraabiakar pushed a commit to noraabiakar/arbor that referenced this issue Nov 26, 2019
@bcumming
Customizable output directories for validation. (arbor-sim#42)
eda2ef5 
Path to validation output can be customized via an environment variable
NS_VALIDATION_PATH_FORMAT which will substitute the following keys:

    %T    Timestamp of invocation of install-local.sh.
    %H    Git commit hash of nsuite (with + on end if modified).
    %h    Git commit short hash of nsuite (with + on end if modified).
    %S    System name, as defined in system environment script or else host name.
    %s    Simulator name.
    %m    Model name.
    %p    Parameter set name.

* Add git-repo-hash script to spit out short or long commit hashes.
* Add pathsub script to perform pattern replacement, optionally relative to a base directory.
* Record installation timestamp and system name in generated environments.
* Export ns_ path variables, together with ns_timestamp and ns_sysname, in generated environments.
* Set validation output path template via  --output/-o option in run-validation.sh, via exported environment variable ns_validation_output_format.
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Update: this is partly resolved by #842, but we don't yet have code that reproduces the analytic time-varying solution.

@halfflat
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halfflat commented Feb 4, 2021

This should be now a validation feature for nsuite; we can close this ticket and refer to it over there.

@halfflat halfflat mentioned this issue Feb 5, 2021
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halfflat commented Feb 5, 2021

Corresponding validation test is now an nsuite issue, #110.

@halfflat halfflat closed this as completed Feb 5, 2021
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