Customize Object Indexing
Customize indexed reference and assignment behavior for objects. User-defined classes possess the same indexing behavior as built-in MATLAB® classes, but you can modify this behavior by inheriting from one or more superclasses.
Modular indexing mixin classes (since R2021b) enable you to customize indexing operations individually. For example, you can customize parentheses indexing by inheriting from
matlab.mixin.indexing.RedefinesParen, while using the default MATLAB behavior for dot and brace indexing without writing additional code.
You can also overload the
subsasgn functions in your classes, but this technique requires you to overload parentheses, dot, and brace indexing, even if you need to customize only one behavior. Using the modular indexing classes is the recommended procedure whenever possible.
|Customize class indexing operations that use parentheses|
|Customize class indexing operations that use dots|
|Customize class indexing operations that use braces|
|Type of customized indexing operation and referenced indices|
|Enforce scalar behavior for class instances|
|Disallow calling public methods using dot notation|
|Calling public methods with dot notation invokes overloaded dot indexing|
Argument List Length
Overloading subsref and subsasgn
|Redefine subscripted assignment|
|Convert object to array index|
|Create structure argument for |
|Execute built-in function from overloaded method|
|Number of arguments for customized indexing based on subsref and subsasgn|
- Customize Object Indexing
MATLAB classes support object array indexing by default.
- Customize Parentheses Indexing for Mapping Class
This example shows how to customize parentheses indexing for a mapping class.
- Forward Indexing Operations
Forward additional levels of indexing after customized indexing operations.
- end as Object Index
Learn how to implement the use of
endfor object indexing.
- Objects in Index Expressions
You can design objects that can be used as indices in indexing expressions.
- Code Patterns for subsref and subsasgn Methods
There are code patterns useful for modifying object indexing.