While using class method to create an object: "Base object for class 'Test_class' constructor is invalid".

I am trying to create a class using state space ss class as parent class and a struct P1 as follows:

    P1.n=0; 
    P1.p=0;
    P1.q=0;
    P1.l=0;
    P1.m=0;
    P1=class(P1,'Test_class',ss);

My guess is there is a problem with size matching but i cannot figure it out.

Answer 1

[Steven Lord]

You cannot define a class using the older class syntax (where you call the class function inside the class's constructor function) that subclasses a class defined using the newer class syntax (one defined using a classdef file.)

From the documentation: "It is not possible to create class hierarchies that mix classes defined before Version 7.6 and current class definitions that use classdef. Therefore, you cannot subclass an old class to create a version of the new class."