*SolverDiffEquation()
Creates a solver differential equation.
Syntax
*SolverDiffEquation(varname, "label")
    Arguments
- varname
 - The variable name for the solver array differential equation.
 - "label"
 - The descriptive label for the solver differential equation.
 
Example
*SolverDiffEquation( sde_equation1, "Example Diff Eq" )
*SetSolverDiffEquation(sde_equation1, , EXPLICIT, 
 `DIF1(sde_equation.id) + 8.0 + COS(TIME)` )
    Context
Comments
Used to create a solver differential equation that can be referenced elsewhere within the model.