This class constrains the value of Prop1 to be greater than or equal to 3.

classdef MyClass
   properties
      Prop1 {mustBeGreaterThanOrEqual(Prop1,3)}
   end
end

Create an object and assign a value to its property.

obj = MyClass;
obj.Prop1 = 2;

Error setting property 'Prop1' of class 'MyClass':
Value must be greater than or equal to 3.

When you assign a value to the property, MATLAB^® calls mustBeGreaterThanOrEqual with the value being assigned to the property. mustBeGreaterThanOrEqual issues an error because the value 2 is not greater than or equal to 3.

function r = mbGreaterThanOrEqual(x)
    arguments
        x {mustBeGreaterThanOrEqual(x,5)}
    end
    r = x - 5;
end

Calling the function with a vector that contains values that are less than 5 does not meet the requirements defined with mustBeGreaterThanOrEqual and results in an error.

x = [12.7, 45.4, 4.9, 77.1, 53.1];
r = mbGreaterThanOrEqual(x);

Error using mbGreaterThanOrEqual
Invalid input argument at position 1. Value must be greater than or equal to 5.