MATLAB: Constructor not working, preallocating object leaves object with no properties

classconstructorfunctionMATLABmethodoopstructures

function obj = ameth(t)
        if nargin > 0
            obj(numel(t)) = ameth;%preallocates the obj
            for i=1:numel(t)
                obj(i).trk = t(i);
            end
        end
    end
This is under methods in my class definition, and is the constructor. trk is the only protected access property. When I call this method (h = ameth), I find that it returns an answer with no properties, but I am expecting to have the property trk. Where have I gone wrong?

Best Answer

Works well here (R2013b)
    >> t = ameth([1:4])
    t = 
      1x4 ameth array with properties:
        trk
    >> t(1).trk
    ans =
         1
    >> [t(:).trk]
    ans =
         1     2     3     4
    >>
where
    classdef ameth
        properties
            trk
        end
        methods
            function obj = ameth(t)
                if nargin > 0
                    obj(numel(t)) = ameth;%preallocates the obj
                    for ii = 1:numel(t)
                        obj(ii).trk = t(ii);
                    end
                end
            end
        end
    end
&nbsp
Addendum triggered by comment
    >> h = ameth([1:4])
    h = 
      1x4 ameth array with no properties.
    >> h.trk
    You cannot get the 'trk' property of ameth. 
    >>
where
    properties
is replaced by
    properties( Access = protected )
Related Question