How to catch warnings?

I want to catch Warning: Matrix is close to singular or badly scaled, during a matrix division A/B.

Answer 1

[Adam]

https://undocumentedmatlab.com/blog/trapping-warnings-efficiently

may help with this. Credit to Guillaume from this answer for the link.

Answer 2

[Geoff May]

You could use the lastwarn function to reset, then check the last warning. Granted this might not work if the warning you are interested in gets overwritten by a subsequent warning that you would rather discard.

        % reset the lastwarn message and id
        lastwarn('', '');

        % call the function that might throw a warning
        diceyFunction();

        % now if a warning was raised, warnMsg and warnId will not be empty.
        [warnMsg, warnId] = lastwarn();

        % you can check the warning message or id, or just throw the warning as an error if desired
        if(isempty(warnId))
            noProblem();
        else
            error(warnMsg, warnId);
        end