Model modularity

When using the SUND toolbox, it is possible to combine models into a single simulation. Furthermore, the outputs from some models can be used as input in other models. These are defined in the INPUTS header and in the OUTPUTS header.

In the example below, m1 has an internal variable named plasma_ins which it provides as an output insulin_plasma to other models, while the model m2 needs ins as an input:

########## NAME
m1
...
########## OUTPUTS
insulin_plasma = plasma_ins

########## NAME
m2
...
########## INPUTS
ins = insulin_plasma

Now, if the models are put together in a simulation, the plasma insulin provided by m1 will be used by m2 automatically:

m1 = sund.load_model('m1')
m2 = sund.load_model('m2')

sim = sund.Simulation(time_unit = 'm', models = [m1, m2])

Using default values for inputs:

It is also possible to define default values that the model should take if the input is not supplied from another model or activity. This is done by using @ value. So, e.g. to set ins to 0 if no input is given for m2:

########## NAME
m2
...
########## INPUTS
ins = insulin_plasma @ 0