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This allows you to build your own personal function library. For a function to be available to other users, you can place the macros with the functions into shared folder on the file system; all users will need to set the environment variable METVIEW_MACRO_PATH to this location before starting Metview.
Extending the Macro Language
It is possible to write your own C/C++/Fortran code and interface it with Metview Macro. In this way we can write functions in another language and call them directly from a macro, passing variables such as vectors, numbers and fieldsets between them. This is beyond the scope of this training course, but be aware that it is possible! It is currently documented in the 2014 Metview training course, and examples are given in the solutions folder if you'd like to have a look.