Programming Utilities

Evaluate expressions or functions indirectly, set timers, handle exceptions

MATLAB^®includes functionality to indirectly evaluate expressions, set timers for program execution, and capture data on errors.

Functions

`eval`	EvaluateMATLABexpression
`evalc`	EvaluateMATLABexpression and capture results
`evalin`	EvaluateMATLABexpression in specified workspace
`feval`	Evaluate function
`run`	RunMATLABscript
`builtin`	Execute built-in function from overloaded method

`timer`	Schedule execution ofMATLABcommands
`delete`	Delete files or objects
`get`	Query graphics object properties
`isvalid`	Determine valid handles
`set`	Set graphics object properties
`start`	Start timer
`startat`	Schedule timer to fire at specified time
`stop`	Stop timer
`timerfind`	Find timer objects
`timerfindall`	Find all timer objects
`wait`	Block command prompt until timer stops running

`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`	返回最后一个未捕获异常
`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

`parfevalOnAll`	Run function on all workers in background
`parallel.pool.Constant`	Copy or create data only once on workers in parallel pool
`canUseGPU`	Verify supported GPU is available for computation
`canUseParallelPool`	Verify that parallel functions can use a parallel pool

Schedule Command Execution Using Timer
To schedule the execution of MATLAB commands, create a timer object.
- Timer Callback Functions
- Handling Timer Queuing Conflicts
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
Create Hyperlinks that Run Functions
Functions that support thematlab:keyword can display hyperlinks, which execute commands when you click the hyperlink text.
替代eval函数
虽然evalfunction 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 usingeval.
Run Parallel Language in MATLAB
You can run parallel code in serial if you do not have Parallel Computing Toolbox™.