Therandnfunction creates normally distributed random numbers.

A = randn(1,5);

Validate that the random numbers are nonnegative.

mustBeNonnegative(A)

Error using mustBeNonnegative (line 14) Value must be nonnegative.

This class constrains the value ofProp1to nonnegative values.

classdefMyClasspropertiesProp1 {mustBeNonnegative}endend

Create an object and assign a value to its property.

obj = MyClass; obj.Prop1 = -10;

Error using mustBeNonnegative (line 14) Value must be nonnegative.

When you assign a value to the property, MATLAB^®callsmustBeNonnegativewith the value being assigned to the property.mustBeNonnegativeissues an error because the value-10is negative.