MATLAB Object-Oriented Programming

Number of Arguments for subsref and subsasgn

In this section...

“How MATLAB Determines Number of Arguments” on page 17-6

“Syntax for subsref, and subsasgn Methods” on page 17-8

How MATLAB Determines Number of Arguments

MATLAB calls subsref or subsasgn to determine the result of executing code that

involves indexed reference or assignment. The number of elements referenced or

assigned by an indexing operation determines the number of arguments MATLAB uses to

call subsref and subsasgn. That is, the indexing code determines the number of

arguments that MATLAB:

• Returns from the call to subsref


• Passes to the call to subsasgn

Therefore, the indexing code determines the value of nargout for the call to subsref

and the value of nargin for the call to subsasgn.

For example, consider the ValuesArray class.

classdef ValuesArray

properties

Values

end

methods

function obj = ValuesArray(v)

if nargin > 0

obj.Values = v;

end

end

end

end

Create an array of 10 ValuesArray objects.

l = ValuesArray.empty;

for k = 1:10

l(k) = ValuesArray(k);

end

17 Specialize Object Behavior