is a helper component. It calculate sum of drug mass from multiple compartments.

The elements of array MArr must be assigned the mass variables that should be summed up (using fully qualified path to the variables) as e.g.

Pharmacolibrary.Pharmacokinetic.TotalMassCalculator body1(MArr = {vein.M, artery.M, TissueCompartment1.M}) 

in the example Pharmacolibrary.Components.Tests.TotalMassCalculator.