Log Error and Warning Messages to Text File

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Sonoma Rich
Sonoma Rich on 16 Jun 2022
Commented: Jan on 17 Jun 2022
Is there a way to log error and warning messages to a text file? I cannot use the "diary" function since I am running Matlab within Cameo System Modeler and don't have a command window.
Walter Roberson
Walter Roberson on 17 Jun 2022
I would suggest using an absolute path for the diary file name, as you might not be cd to where you expect.

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Answers (2)

Jan on 17 Jun 2022
You can catch errors using try-catch and write the messages whereever you want.
Redirecting warnings is more tricky. I use my own warning functions, but warnings created by toolbox functions are harder to catch. You can shadow the built-in function "warning" by a user-defined function, which is store in a folder on top of Matlab's path:
function warning(varargin) % [UNTESTED CODE!!!]
Msg = evalc('builtin(''warning'', varargin{:})');
... % ==> write the message to your log file
This looks ugly, but maybe it works.
I do not trust code, which shows warnings. After inverting a matrix, I check the lastwarn state and drop an error in case of problems. If this happens repeatedly, I add some code to check condition of the matrix before the inverting. So I do not used code for productive work, which drops warnings.

Sonoma Rich
Sonoma Rich on 17 Jun 2022
I tried that. The diary file was created, but had nothing in it. I appears the CSM is overriding the stdout and stderr.
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Jan on 17 Jun 2022
Is this an answer or a comment? In the latter case, please post it in the coirresponding section for comments. Thanks.

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