forcing try catch loop during using another script

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ayman mounir
ayman mounir on 13 Aug 2019
Edited: Walter Roberson on 20 Aug 2019
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

Answers (1)

chrisw23
chrisw23 on 14 Aug 2019
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
  4 Comments
Walter Roberson
Walter Roberson on 20 Aug 2019
"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() .

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