The V Component

Other Variables

The system for model building in ramp.xds includes a method to compute other variables. In a nutshell, any variables in the model that must be computed endogenously are indexed, computed by dVdt(t, y, pars), and returned in the same way as the variables. Any module that uses one of these other variables must be set up through Advanced Setup option.

A port for dVdt is present in Basic Setup, by the command setup_other_variables and for an xds model object called model, it is executed like this:

model <- setup_other_variables(model) 

This command sets up

model$Vpar[[1]] 

as an empty list of class setup, and dVdt.setup returns model unmodified.

Any model can use dVdt to extend the computational framework in some way. The best way to understand dVdt is through examples:

• none so far