typename — associates a name to variable type
[types [ [,names]]=typename() typename(name,type)
integer column vector: the types codes of each defined data types.
column vector of strings: the names associated to type codes.
integer: the type code of new data type.
string: the name associated to the type code
The function and operator overloading make use of a formal name
associated to data types to form the name of the overloading function
(see overloading). The typename can be used to handle this
formal names for hard coded data types (the tlist or mlist
coded data types formal names are defined in an other way, see overloading).
Called without right hand side argument, typename returns
information on defined data types.
Called with right hand side argument, typename associates a name
to a data type code.
typename('',type) suppress the data type given by its code
type out of the table of known data types.