How different is CMLMT from CML?
A. The primary difference is that CMLMT uses structures to handle data, parameter, and specifications of the optimization. Instead of global variables there is now a “control” structure. The data and the parameter starting point are also handled using structures in CMLMT. This use of structures significantly changes the command files, and makes it somewhat difficult to port CML command files to CMLMT. CMLMT uses the DS data structure and the PV parameter structure which are both defined in the Run-Time Library. They considerably increase the flexibility of the optimization. For a discussion of these structures in the context of optimization using Sqpsolvemt, see the paper “Structures and Sqpsolvemt” at http://www.aptech.com/papers. The PV parameter structure allows you to store and retrieve parameters without having to know where they are in the parameter vector. And it adds flexibility to likelihood procedures that are frequently modified. This was often a tedious task in CML that had
