function obj = saveobj(B)
%SAVEOBJ Save filter for objects.
%
%    B = SAVEOBJ(A) is called by SAVE when an object is saved to a .MAT
%    file. The return value B is subsequently used by SAVE to populate the
%    .MAT file.  SAVEOBJ can be used to convert an object that maintains 
%    information outside the object array into saveable form (so that a
%    subsequent LOADOBJ call can recreate it).
%
%    SAVEOBJ will be separately invoked for each object to be saved.
%
%    SAVEOBJ can be overloaded only for user objects.  SAVE will not call
%    SAVEOBJ for a built-in datatype (such as double) even if @double/saveobj
%    exists.
%
%    See also SAVE, LOADOBJ.
%

%    RDD 12-9-2001
%    Copyright 2001-2002 The MathWorks, Inc. 
%    $Revision: 1.2 $  $Date: 2002/03/14 14:34:49 $

obj = B;

if isvalid(obj)
    ud = get(obj,'UserData');
    obj.ud = ud; % restore the userdata!
end