I got an error when I tried to initialize a property of a class to another MATLAB class. The error read:
Conversion to double from (Class Name) is not possible.
So I looked for a way to specify the type of a property and found the link above. In short,
@Type needs to follow the name of a property like
classdef (Class Name) properties property@Type end end
property Type is also possible since MATLAB R2016a.