GETUSER

Return the user field of a mapping

     USERFIELD = GETUSER(W,FIELD,SUB)

Input
W	Mapping
FIELD	Character string: name of structure field of USER field of W.
SUB	Sub-field or cell index, default: return entire field.

Output
USERFIELD	Requested field

  If FIELD is is the empty string ('') the entire user field is returned.

If the requested field does not exist USERFIELD = [];

Note the the USER field of mappings was originally intended for a user  defined description of mappings. Later its usage was extended to a field  for storing general information on mappings. For that reason 'old'  mappings without a structure in the user field are transformed such that  this information is stored in a subfield USER in the user field. It can  be retrieved by GETUSER(W).