A is an array of numbers that is the result of a calculation:

A = sin([-1,0,1]);
mustBeNonzero(A)

Error using mustBeNonzero (line 14)
Value must not be zero.

This class restrict the value of Prop1 to be nonzero.

classdef MyClass
   properties
      Prop1 {mustBeNonzero}
   end
end

Create an object and assign a value to its property.

obj = MyClass;
obj.Prop1 = sin([-1,0,1]);

Error setting property 'Prop1' of class 'MyClass':
Value must not be zero.

When you assign a value to the property, MATLAB calls mustBeNonzero with the value being assigned to the property. mustBeNonzero issues an error because the one of the values in A is zero.

function r = mbNonzero(A,offset)
    arguments
        A {mustBeNumeric}
        offset (1,1) {mustBeNonzero}
    end
    r = A + offset;
end

Calling the function with a value for offset equal to zero does not meet the requirements of mustBeNonzero and results in an error.

A = [12.7, 45.4, 98.9, 77.1, 53.1];
r = mbNonzero(A,0);

Error using mbNonzero
Invalid input argument at position 2. Value must not be zero.