The result of [objArray.propertyOne] will always be a row vector independent of the shape of objArray, so I don't think having the output object array in column vector form will help you (but you can use vertcat(objArray.propertyOne) instead ).
To answer your question, though, you can ensure a column vector shape by building and shaping the array inside the constructor, e.g., with
function objArray=MyClass(varargin)
% objArray=MyClass(dim1,dim2,dim3,...)
if nargin==0, return;end
objArray(varargin{:})=MyClass;
if nargin==1
objArray=objArray(:);
end
or whatever the condition should be.
