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Overloading SIZE for Array-like User-Defined Objects

version (2.09 KB) by Matt J
A tool for OOP overloading of the size() method, imitating I/O conventions of MATLAB's native SIZE.


Updated 14 Dec 2010

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parseSize - a function to aid OOP overloading of the size() method in user-defined classes. If the user provides the vector of dimensions of a hypothetical array object, parseSize will take care of the main input/output argument processing in a way that imitates the conventions of MATLAB's usual SIZE function.

EXAMPLE: consider the following class and notice how parseSize is used to implement the SIZE method in a single line,

classdef myClass
end % properties

function varargout=size(obj,varargin)

In the next several examples, we see that all of the same calling syntaxes as for the usual MATLAB size() function are now enabled for this class:

>> obj=myClass; obj.dimension=[3,5,4,1];

>> [m,n,p,q,r,s]=size(obj); [m,n,p,q,r,s]

ans =

3 5 4 1 1 1

>> [m,n]=size(obj); [m,n]

ans =

3 20

>> s=size(obj)

s =

3 5 4

>> s2=size(obj,2)

s2 =





dimensions: A vector specifying the dimensions of a hypothetical array-like
object. Trailing ones are permitted.

numargsout: The number of requested outputs in a call to the class'
size method, e.g., for [m,n,p]=size(obj) a value of
numargsout=3 should be passed to parseSize.

dim: if the calling syntax to the class's size method is size(obj,i),
one would pass dim=i to parseSize.


argsout: a cell array to be passed as the varargout of the size method.

Cite As

Matt J (2021). Overloading SIZE for Array-like User-Defined Objects (, MATLAB Central File Exchange. Retrieved .

MATLAB Release Compatibility
Created with R2009b
Compatible with any release
Platform Compatibility
Windows macOS Linux

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