Spine Template

[stil]

Hello,

I am trying to build a "Spine" model that i could instantiate multiple times...
Thus i thought using a template (shouldn't I ?) that currently has the form :

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begintemplate Spine

public spine, neck

create spine, neck

objref all
all = new SectionList()
neck all.append()
spine all.append()

external lambda_f

proc init() {
   // topology
   connect spine(1), neck(0)
   // geometry
   neck{
      L = 0.7 //um
      diam = 0.1 //um
   }
   spine{
      L = 0.2 //um
      diam = 0.2 //um
   }
   //nseg
   forsec all { nseg = int((L/(0.1*lambda_f(100))+.9)/2)*2 + 1  }
}

endtemplate Spine


But, when i am trying to instantiate it,

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load_file("Spine.hoc")
objref syn[1] // same with objectvar
syn[0] = new Spine()


i cannot get rid of this message :

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x86_64/bin/nrniv: nil object is not a SectionList

What haven't I understood here ? Would you mind guiding me please ?

[stil]

ok, i've found out :

the all sectionList is not visible from the inside of init() procedure.
Hence i replaced the templte definition by the following :

Code: Select all

begintemplate Spine
   external lambda_f
   public spine, neck
   public init
   create spine, neck

   proc init() {
      // topology
      connect spine(1), neck(0)
      // geometry
      neck{
         L = 0.7 //um
         diam = 0.1 //um
         nseg = int((L/(0.1*lambda_f(100))+.9)/2)*2 + 1
         }
      spine{
         L = 0.2 //um
         diam = 0.2 //um
         nseg = int((L/(0.1*lambda_f(100))+.9)/2)*2 + 1
         }
      }

endtemplate Spine


[ted]

Interesting, but not quite something that anyone would like to steal (not yet anyway), so I moved it from "NEURON hacks" to the "Anatomically detailed models" area where it will probably get more attention.
Also probably needs a new title, now that you've fixed the "nil object is not a SectionList" problem. How about "spine template"?

[stil]

Sure,

is it ok like this ?