Property Definition Block
The following illustration shows a typical property specification. The
end keywords delineate a block of code that defines properties having the same attribute settings.
Properties cannot have the same name as the class.
For an example, see Creating a Simple Class.
Assigning a Default Value
The preceding example shows the
Coefficients property specified as having a default value of
[0 0 1].
You can initialize property values with MATLAB® expressions. However, these expressions cannot refer to the class that you are defining in any way, except to call class static methods. MATLAB executes expressions that create initial property values only when initializing the class, which occurs just before first using the class. See Property Default Values for more information about how MATLAB evaluates default value expressions.
Define One Property Per Line
Property names must be listed on separate lines. MATLAB interprets a name following a property name as the name of a class.
Restrict Property Values
You can restrict property values by associating a class with the property in the property definition. For example, the definition of
MyData requires that values assigned to this property must be of type
int32 or types that are compatible with
properties MyData int32 end
For more information, see Validate Property Values.
Access Property Values
Property access syntax is like MATLAB structure field syntax. For example, if
obj is an object of a class, then you can get the value of a property by referencing the property name:
val = obj.PropertyName
Assign values to properties by putting the property reference on the left side of the equal sign:
obj.PropertyName = val
When you access a property, MATLAB executes any property set or get access method and triggering any enabled property events.
Inheritance of Properties
When you derive one class from another class, the derived (subclass) class inherits all the properties of the superclass. In general, subclasses define only properties that are unique to that particular class. Superclasses define properties that are used by more than one subclass.
Specify Property Attributes
Attributes specified with the
properties keyword apply to all property definitions that follow in that block. If you want to apply attribute settings to certain properties only, reuse the
properties keyword and create another property block for those properties.
For example, the following code shows the
SetAccess attribute set to
private for the
Order properties, but not for the
For information about the properties of a specific class, use the