forcing try catch loop during using another script

Hello People

I have a problem in try catch loop,

I have number of files and I analyze these files by calling another script which has the analysis code.

for example let's say in the main script I am writting as the following:

num_files=20
[filename, pathname] = uigetfile([strPathLife ...  '\...\*.xlsx;*.xlsm'], ..   'Excel-File auswählen',...  'MultiSelect','on')   %this mean the first fiel would be file(1), file(2),... etc
    for i=num_files
    try
        analysis_code(file(i))  % analysis_code is another script analyzes the data of the files
    catch
        disp('error')
    end
    end

according to this code it should analyze all the file disregarding if the there is error in analysing one file or more.

Thanks in advance

Ayman Mounir

[Stephen23]

See also original question: https://www.mathworks.com/matlabcentral/answers/475519-try-catch-loop-to-evaluate-what-contains-in-the-folder

[Jackson Burns]

What is the problem? Can you provide an error or some more specific examples?

Answer 1

[chrisw23]

The analyze script should return a result code to be evaluated. To catch any analyze fail use the assert function. Error codes can be defined in the analyze function.

i.e. (user defined exceptions)

num_files=20
[filename, pathname] = uigetfile([strPathLife ...  '\...\*.xlsx;*.xlsm'], ..   'Excel-File auswählen',...  'MultiSelect','on')   %this mean the first fiel would be file(1), file(2),... etc
for i=num_files
    try
        msg = analysis_code(file(i))  % analysis_code is another script analyzes the data of the files
        assert(strcmp(msg,'No Error'),msg); % default msg = 'No Error'
    catch ex
        disp(ex.message)
    end
end

Hope it helps

Best regards Christian

[ayman mounir]

Hello christian

Thanks for your answer the problem when there is an error in analyzing one file the code should try the next file until it finshed from the analyzing all the uploaded files.

My opinion is the try catch function is only local code I mean if i am calling another matlab file and it has an error the whole process will be stopped.

Regards

Ayman

[ayman mounir]

for more clarification

num_files=20
[filename, pathname] = uigetfile([strPathLife  ...  '\...\*.xlsx;*.xlsm'], ..   'Excel-File auswählen',...  'MultiSelect','on')   %this mean the first fiel would be file(1), file(2),... etc
for i=num_files
    try
        msg = analysis_code(file(i)); % if there is an error inside %analysis  
        % code during analyzing file(1)  the proccess will be %stopped. 
        % the code should try file(2)
        assert(strcmp(msg,'No Error'),msg); % default msg = 'No Error'
    catch ex
        disp(ex.message)
    end
end

[Adam Danz]

Why call assert()? Assert() generates an error and you're trying to avoid the error by the try/catch, right? Try removing assert() and see if the problem is fixed.

[Walter Roberson]

"My opinion is the try catch function is only local code I mean if i am calling another matlab file and it has an error the whole process will be stopped."

No, that is not correct. try/catch can trap error() or throw() calls generated by MATLAB routines any number of call levels below.

There are a small number of things that come to mind that try/catch cannot handle, which will abort all of the levels of calls

1. out of memory
2. control-C
3. process being killed
4. operating system process abort due to bad pointer (relevant for calling mex and loadlibrary() routines)

Also, try/catch cannot detect problems in external executable started with system() or dos() .