Using MathMaps

A MathMap is an AST Object which contains a recipe for transforming positions from one co-ordinate Frame  to another and (optionally) back again. These transformations are specified using arithmetic operations and mathematical functions similar to those available in Fortran. WCSADD can be used to create a MathMap and store it in a text file, and such text files can then be used by applications such as REGRID which require a mapping.