MATLAB: How to catch an error

errror

Hi,

if I get an error I want change the algorithm: like this:

if ERROR
ALGORITHM 2
else
ALGORITHM 1
end

Hope someone can help.

Thank YOu!

Best Answer

Try it like this:

try
  % No error yet, so try to run algorithm 1
  algorithm1();  
catch ME
  % You get here if algorithm 1 bombs.
  % Create an informative error message.
  errorMessage = sprintf('An error occurred in function blah_fubar().  The error reported by MATLAB is:\n\n%s\nClick OK to run algorithm2()', ME.message);
  % Print error message to command window.
  fprintf('%s', errorMessage);
  % Alert the user via a popup message.
  uiwait(warndlg((errorMessage));
  % Now run algorithm 2, because we had the error occur.
  algorithm2();
end

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MATLAB: Error dialog instead of error message in command window

Try this:

try
  % Some code that generates an error/exception.
catch ME
  errorMessage = sprintf('Error in function blah_blah_blah().\n\nError Message:\n%s', ME.message);
  % Print to command window.
  fprintf(1, '%s\n', errorMessage);
  % Display pop up message and wait for user to click OK
  uiwait(warndlg(errorMessage));
end

MATLAB: Catch or catch something? – Try, catch, end.

If you take a look at the documentation, you can see that catch ME stores the exception (all error information) in the variable ME. This can be useful if there are multiple errors that you expect to occur, so you can vary your response based on information like the error ID.

You will also need the exception if you want to throw, rethrow or throwascaller.

Best Answer

Related Solutions

MATLAB: Error dialog instead of error message in command window

MATLAB: Catch or catch something? – Try, catch, end.

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