Log Error and Warning Messages to Text File

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Sonoma Rich 2022-6-16

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评论： Jan 2022-6-17

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.

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Sonoma Rich 2022-6-17

The reason has to do with the fact I am using Matlab within No Magic's Cameo System Modeler (CSM) application. It calls Matlab functions from within its simulation toolbox. Output to the command window seem to be disregarded. I tried using the "diary" function by typing "diary logfile.txt" from with the Matlab command line input in CSM, but it did not work. Also the "disp" function does not output messages.

Can I define the files for the output from stdout and stderr?

Walter Roberson 2022-6-17

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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Answer 1

Jan 2022-6-17

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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
end

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.