@ folders - what is it?

Hi,

I am looking for information about the @ - directories, I've found only: http://www.mathworks.com/help/techdoc/matlab_oop/brfynrp- 1.html#brfynrp-2

So I have question:

Why do you need these folders?

Only for organizing classes?

Or is there any other application?

Answer 1

[Titus Edelhofer]

The second question is the answer: yes, it's "only" for organizing classes.

You can either use only one file or several files (each one method) in a class folder (@classname). Or a mixture. Take a look at

web([docroot '/techdoc/matlab_oop/brqy4ox-1.html'])

Titus

[Grzegorz Knor]

Thanks.

I couldn't understand the 'strange' behavior of Matlab :)

pwd

% ../@test

ls

% not_test.m test.m

type test

% function test

% disp(mfilename)

% not_test

type not_test

% function not_test

% display(mfilename)

test

% ??? Undefined function or variable 'test'.

not_test

% ??? Undefined function or variable 'not_test'.

cd ..

test

% test

% ??? Undefined function or variable 'not_test'.

% Error in ==> test.test at 3

% not_test

not_test

% ??? Undefined function or variable 'not_test'.

[Jan]

@Titus: I do not agree. E.g. @cell folders are helpful to apply a specific function for CELL input. I would not call this "organizing classes", but on the other hand, a CELL is a built-in class also.

Answer 2

[Jan]

The @-folders can be used to call a specific function depending on the class of the input. E.g. you can create two functions with the same name, but in different @-folders:

D:\MFiles\@double\show.m
D:\MFiles\@cell\show.m

Now show(8) calls @double/show, while show({8}) calls @cell/show. This is equivalent to the usage with objects.

Note, that only 'D:\MFiles' is included in the MATLAB path in this case, and not the @-folders.