Detect warning and take action
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Ioannis Nemparis
on 2 Nov 2017
Commented: Rookienp
on 5 Jun 2019
I have a for loop and I call a function inside it. What I want to do, is detect if this function call created any warnings and if so continue. Something like:
for i=1:len
c = my_func1(arguments);
if (any warning)
continue;
end
end
Any suggestions? I tried to use lastwarn, without success though.
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Accepted Answer
Cam Salzberger
on 2 Nov 2017
Hello Ioannis,
for ...
warning('') % Clear last warning message
... run code ...
[warnMsg, warnId] = lastwarn;
if ~isempty(warnMsg)
...react to warning...
end
end
But you said lastwarn didn't work for you. How did you use it? What do you mean it didn't work? What kind of warnings were you seeing that weren't being picked up?
-Cam
2 Comments
Rookienp
on 5 Jun 2019
Suggestion in the Matlab 2018b editor:
WARNING('') does not reset the wanring state, use LASTWARN('') instead.
Both ways work though.
More Answers (2)
Guillaume
on 2 Nov 2017
Edited: Guillaume
on 2 Nov 2017
You can treat warnings as errors and thus catch them with a try ... catch statement, however, it is undocumented and may break in a future version. On the other hand, it's been there since 2004.
However, if you want to catch all warnings, you'll have to set them to error one by one since warning('error') or warning('error', 'all') is not supported, just warning('error', specificmsgid).
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