4  a3 methods

The following functions and methods are available for a3 objects:

• toa3(): create new a3 objects
• as.a3(): convert an existing list to an a3 object
• plot.a3(): plot an a3 object using rtemis
• write.a3json(): write an a3 object to a JSON file
• read.a3json(): read an a3 object from a JSON file created by write.a3json()