The NumericException(event) function returns the exception string associated with event.

$\mathrm{NumericException}\left('\mathrm{division\_by\_zero}'\right)$

$''numeric\; exception:\; division\; by\; zero''$

MyHandler := proc( f, ops, defVal )
    if NumericEventLocation = 'MyProc' then
        error NumericException( 'division_by_zero' );
      else
        NumericStatus( 'division_by_zero' = false );
        defVal;
    end if;
end proc:

$\mathrm{NumericEventHandler}\left('\mathrm{division\_by\_zero}'=\mathrm{MyHandler}\right)$

$\mathrm{division\_by\_zero}=\mathrm{default}$

MyProc := proc(a,b) a/b; end proc:

$\frac{1.}{0.}$

$Float\left(\mathrm{\infty }\right)$

$\mathrm{MyProc}\left(1.\,0.\right)$

Error, (in `anonymous procedure called from MyProc`) numeric exception: division by zero