d = 0:9;
A = 1./d;
mustBeFinite(A)

Error using mustBeFinite (line 13)
Value must be finite.

The division by d resulted in one element becoming Inf, which causes an error.

This class restricts the value of Prop1 to finite values.

classdef MyClass
   properties
      Prop1 {mustBeFinite}
   end
end

Create an object and assign a value to its property.

d = 0:9;
obj = MyClass;
obj.Prop1 = 1./d;

Error setting property 'Prop1' of class 'MyClass':
Value must be finite.

When you assign a value to the property, MATLAB^® calls mustBeFinite with the value being assigned to the property. mustBeFinite issues an error because the result of division by 0 is Inf.

function s = mbFinite(x)
    arguments
        x (1,:) double {mustBeFinite}
    end
    n = length(x);
    m = sum(x)/n;
    s = sqrt(sum((x-m).^2/n));
end

Calling the function with an input that does not meet the requirement of mustBeFinite results in an error.

values = [12.7, 45.4, 98.9, Inf, 53.1];
s = mbFinite(values);

Error using mbFinite
Invalid input argument at position 1. Value must be finite.