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A couple questions. One: is there a defined way in CellML to find the
independent variables? The spec says (about 'initial_value'):

This attribute provides a convenient means for specifying the value of a
scalar real variable when all independent variables in the model have a
value of 0.0. Independent variables are those whose values do not depend
on others.

>From that definition, it would seem that if you defined 'pi' in your
model, the initial value would apply when pi was equal to 0.

But more generally, if you have a single equation in your model:

u = sin(t)

That's a single equation with two variables--how do you decide that you
want to vary t and not u? Do you just apply heuristics, so if you see
'dx/dy' you assume y is the independent variable? Is it part of what you
do *with* a CellML model, that you present the user with t and u as
possible options, and they pick one?


My second question is a bit simpler: is there a way to define a delay
equation in CellML and if so, how do you do it? (A delay being
something like 'x, 2 seconds ago'.)

-Lucian

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• [cellml-discussion] Independent variables, and delay, Lucian Smith, 12/17/2011
  • [cellml-discussion] Independent variables, and delay, David Nickerson, 12/17/2011
    • [cellml-discussion] Independent variables, and delay, Lucian Smith, 12/17/2011
      • [cellml-discussion] Independent variables, and delay, David Nickerson, 12/17/2011

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