Advanced Evaluation and Exception Handling

Evaluate expressions, capture data on errors

MATLAB^® includes functionality to indirectly evaluate expressions and to collect data about errors.

Any MATLAB code that detects an error and throws an exception constructs an MException object. MATLAB can throw either predefined exceptions or exceptions that you construct.

Functions

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Evaluate Expressions

`eval`	Evaluate MATLAB expression
`evalc`	Evaluate MATLAB expression and capture results
`evalin`	Evaluate MATLAB expression in specified workspace

Capture Error Information

`try, catch`	Execute statements and catch resulting errors
`MException`	Capture error information
`addCause`	Record additional causes of exception
`addCorrection`	Provide suggested fix for exception
`getReport`	Get error message for exception
`MException.last`	Return last uncaught exception
`rethrow`	Rethrow previously caught exception
`throw`	Throw exception
`throwAsCaller`	Throw exception as if occurs within calling function
`matlab.lang.correction.AppendArgumentsCorrection`	Correct error by appending missing input arguments
`matlab.lang.correction.ConvertToFunctionNotationCorrection`	Correct error by converting to function notation
`matlab.lang.correction.ReplaceIdentifierCorrection`	Correct error by replacing identifier in function call

Topics

Alternatives to the eval Function
Although the eval function is very powerful and flexible, it is not always the best solution to a programming problem. In many instances, there are recommended alternative approaches to using eval.
Exception Handling in a MATLAB Application

It is a good programming practice to include error checking in your programs to ensure reliable operation under all conditions. You can decide how your programs respond to different types of errors.
- Throw an Exception
- Respond to an Exception