MATLAB: Issue with SimBiology – parameters from valid .sbproj not loading

parameter arraySimBiology

Hi, I am having an issue pertaining to some *.sbproj models. See for example the attached simple Lotka model version.
While the general model information indicates that there are 3 parameters, 4 reactions, 4 species etc.
   SimBiology Model - lotka 
   Model Components:
     Compartments:      1
     Events:            0
     Parameters:        3
     Reactions:         3
     Rules:             0
     Species:           4
the following commands
m1.Reactions
m1.Parameters
m1.Species
result in display of reactions and species arrays only
   SimBiology Reaction Array
   Index:    Reaction:
   1         x + y1 -> 2 y1 + x
   2         y1 + y2 -> 2 y2
   3         y2 -> z
ans =
  0×1 empty double column vector
   SimBiology Species Array
   Index:    Compartment:    Name:    InitialAmount:    InitialAmountUnits:
   1         unnamed         x        1                 
   2         unnamed         y1       900               
   3         unnamed         y2       900               
   4         unnamed         z        0
The parameter array is empty!
What is wrong with the attached 'lotka.sbproj' file? Strangly enough the simulation runs just fine producing the expected results. I attach the simulation script as well.
Any comments would be very appreciated. M

Best Answer

As described here, parameters can be scoped to either the model or to a reaction. The display counts both scopes of parameters, but the model's Parameters property only lists model-scoped parameters. I agree that this difference is quite confusing! But there is a way to programatically get all parameters on a model using sbioselect:
allParameters = sbioselect(m1, 'Type', 'parameter')
-Arthur
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