MATLAB: Unable to clear classes

chicken-and-eggclassclear classeshandle classoopoop bugs

At times I am unable to clear classes in Matlab without restarting the program. This seems to be related to errors being thrown in the class. In other words, following an error I might make a change to the class and then call "clear classes" to reset everything. Also, since 95% of the time I am working with handle classes, this may be handle class related.

Some issues I have run across that I know are not currently the problem are: 1) storage of the class in a figure which is still open 2) the default value of a property being a class

Thanks, Jim

Best Answer

This is a bug:

893538

It has been fixed in 2013a

Related Solutions

MATLAB: Inability to clear object definition – nonfunctional “clear classes”

Your hunch is correct!

clear() does not destroy the object, it only clears the handle to the object. This is the exact same as:

h = figure;
clear

The figure is still open but h is gone.

As long as the classes inherit from handle, they will have a factory delete method, make sure to delete them:

delete(h);
clear(h);

This can occur in R2012b if objects are saved in -v7.3 format files. When the file is read in, this warning will occur until a fresh session of MATLAB is started. Be sure to use -v7 when saving MAT files with objects in R2012b

MATLAB: Is there inheritable behavior (or a Mixin) for setting/getting the ‘Parent’ and ‘Children’ properties of a custom class

"make the following code error-free"

There is a problem regarding handle or value class. In the code it's assumed that superClass is a handle-class, however it's defined as a value-class. I assume you intended it as a handle-class and replace

classdef superClass

classdef superClass < handle

Furthermore, I replace subClass by

classdef subClass < superClass
    properties
    end
    methods
        function obj = subClass( varargin )
            obj@superClass( varargin{:} );
        end
    end
end

(propably not needed)

Now

%%

dad = superClass();
son = subClass( 'Parent', dad );
%%
if ismember( dad, son.Parent )
    disp( 'hooray' )
else
    disp( 'booooo' )
end

prints hooray in the Command Window

"there is inheritable behavior for this?" AFAIK: No

Best Answer

Related Solutions

MATLAB: Inability to clear object definition – nonfunctional “clear classes”

MATLAB: Is there inheritable behavior (or a Mixin) for setting/getting the ‘Parent’ and ‘Children’ properties of a custom class

Related Question