Hi Eike,
The “matlab.io.datastore.FileDatastore” class does not implement the “matlab.io.Datastore” interface. As a result, “assert(isa(ds, 'matlab.io.Datastore'), ...)” returns “false” when used for “fileDatastore()” instance.
You can verify this by using the “superclasses” function, which lists all the superclasses of a given class.
superclasses(ds)
Output:
From the output above, you can see that “matlab.io.datastore.FileDatastore” implements “matlab.io.datastore.Datastore” instead of “matlab.io.Datastore”. Therefore, you need to modify the code as follows to return “true”:
assert(isa(ds, "matlab.io.datastore.Datastore"), ...);
To know more about “fileDatastore”, refer to the following documentation link:
