Object oriented programming problem?

I writing a program using object oriented programming in matlab 2016b. The program gives the following error:

Error using MyPr1.internalcode.Neural.FourDimensionData

The specified superclass 'MyPr2.ap.datashare' contains a parse error, cannot be found on MATLAB's search path,

or is shadowed by another file with the same name.

The FourDimensionData and datashare are in different folders. All are private.

The error code segment is:

classdef FourDimensionData < ...
        MyPr2.ap.datashare &...
        MyPr2.ap.datashare.Reconstruct &...
        MyPr2.ap.datashare.restore &...

How can I solve this error?

Answer 1

[Andrey Kiselnikov]

Hi, you can check this manual https://www.ee.columbia.edu/~marios/matlab/MatlabStyle1p5.pdf . It was very useful for me, when I started oop in MATLAB. Also you should check ALL file paths in your application. I prefer to write some function like attached, that configures all file paths before execution.

function config_paths
    rootDir = fileparts(which('config_paths'));
    path2add{1} = rootDir;
    path2add{2} = [rootDir,'folder_1'];
    path2add{3} = [rootDir,'folder_2'];
% etc
end

Answer 2

[per isakson]

MyPr2.ap.datashare, is that a folder, ...\+MyPr2\+ap\+datashare, or a classdef-file, ...\+MyPr2\+ap\datashare.m ?

Your code snippet indicates that in the folder, ...\+MyPr2\+ap\, you have a folder named, +datashare, together with a file named, datashare.m. Is that the case?

[K M Ibrahim Khalilullah]

Thank you very much for your comment. \+MyPr2\+ap\+datashare are folders but Reconstruct and restore are file, that means Reconstruct.m and restore.m

[per isakson]

See Classdef Block, Superclass Syntax

SuperclassName must be the name of a class. IMO: That could have been more clearly stated the documentation.

classdef FourDimensionData < ...
        MyPr2.ap.datashare &...             % You cannot inherit from a folder
        MyPr2.ap.datashare.Reconstruct &...
        MyPr2.ap.datashare.restore &...