Identifier Selection Statements:
Traverse Identifier Statements:
Traverse Unique Statement:
Define Include Statements:
These statements are the advanced, sophisticated and instrumental statements of the Matrix language. By incorporating new pattern statements, Matrix becomes a fully extensible language that continuously evolves.
Pattern statements are discovered by users of the language and appear as arrangements of primitives and other patterns which provide some generically useful functionality. Patterns are important because not only do they make the Matrix code more readable and concise, they also signal the analyst's intention to the Model Compiler which enables more efficient source code to be generated and more sophisticated error checking to be performed.
Generally, applicable patterns are incorporated into the Model Compiler (therefore, into subsequent generations of Model Compilers) and become part of the growing Matrix language.
Implementation of a pattern statement will always be more efficient than the equivalent primitive statements. A general rule is that it must always be possible to implement a pattern statement in terms of two or more primitive statements.
Pattern statements must not rely on the use of temporary process data. Indeed, one of the motivations for creating a pattern statement is to eliminate the need for the definition of process data in a model specification, thereby simplifying the code in the model.