MATLAB Object-Oriented Programming

numArgumentsFromSubscript function to control nargout for subsref and nargin

for subsasgn. For more information and examples, see numArgumentsFromSubscript.

Indexing Structure Describes Indexing Expressions

The indexing structure contains information that describes the indexing expression. Class

methods use the information in the indexing structure to evaluate the expression and

implement custom behavior.

For example, the CustomIndex class defines a property that you can use in indexing

expressions.

classdef CustomIndex

properties

DataArray

end

end

Create an object and assign a 5-by-5 matrix created by the magic function to the

DataArray property.

a = CustomIndex;

a.DataArray = magic(5);

This subscripted reference expression returns the first row of the 5-by-5 matrix.

a.DataArray(1,:)

ans =

17 24 1 8 15

This expression assigns new values to the first row of the array stored in the DataArray

property.

a.DataArray(1,:) = [1 2 3 4 5];

This assignment statement uses:

• A '.' type reference


• A property name following the dot (that is, DataArray)


• A range of indices (1,:) within parentheses

17 Specialize Object Behavior