Throw exception as if occurs within calling function
an exception as if it occurs within the calling function. The exception
terminates the currently running function and returns control to the
keyboard or an enclosing
catch block. When you
throw an exception from outside a
try/catch statement, MATLAB® displays
the error message in the Command Window.
You can access the
MException object via a
In some cases, it is more informative for the error to point
to the location in the calling function that results in the exception
rather than pointing to the function that actually throws the exception.
You can use
throwAsCaller to simplify the error display.
exception— Exception containing cause and location of error
Exception containing the cause and location of an error, specified
as a scalar
Create a function,
sayHello, in your
function sayHello(N) checkInput(N) str = ['Hello, ' N '!']; disp(str) function checkInput(N) if ~ischar(N) ME = MException('sayHello:inputError','Input must be char.'); throw(ME) end
At the command prompt, call the function with a numeric input.
Error using sayHello>checkInput (line 9) Input must be char. Error in sayHello (line 2) checkInput(N)
The top of the stack refers to line 9 because this is where MATLAB throws the exception. After the initial stack frame, MATLAB displays information from the calling function.
line 9 of
sayHello.m and call the function again.
Error using sayHello (line 2) Input must be char.
The top of the stack refers to line 2 because that is the location of the error in the calling function.