How can I check if an object is an instance of a class in MATLAB R2023a?

I have an object "myObj" and I would like to check if it is an instance of a class "MyClass", how can this check be achieved in MATLAB R2023a?

Answer 1

[MathWorks Support Team]

There are two ways to check if an object is an instance of a class in MATLAB R2023a:

1. Using the "isa" function and hard-coding the class name as a string. In code, this is achieved as follows:

>> isa(myObj, 'MyClass')

For more information, please refer to the following documentation page for "isa":

https://uk.mathworks.com/help/releases/R2023a/matlab/ref/isa.html

2. Using relational operators over metaclasses. To get the metaclass of your object, use the "metaclass" function. Then, you can compare metaclasses with the less than or equal to operator to check if one metaclass is a class or subclass of another:

>> metaclass(MyObj) <= metaclass(MyClass)

For more information about operators you can use with metaclasses, see the linked documentation section, "Specialised operators and functions":

https://uk.mathworks.com/help/releases/R2023a/matlab/ref/meta.class-class.html#:~:text=Specialized%20Operators%20and%20Functions