## ŒERX Error trapping

Note: The use of ŒERX is now deprecated. We recommend that you use the structured-control error trapping mechanism (`:Try :CatchIf :CatchAll :EndTry`) instead.

The monadic system function ŒERX is followed by a line number. Its effect is to set or clear error trapping. It takes a scalar integer argument which is a line number (or label) in the function. If an error occurs in the error trapped function, or functions called by the error trapped function, control is passed to the specified line. ŒERX returns the previous value set.

                 [2]  R„ŒERX ERRLAB
                  .
                  .
                 [20] ERRLAB: 'HALTED, ERROR'
                 [21] 'ERROR WAS ',ŒR, ŒERM

To switch off error trapping, use an argument of 0.

Topic: APLX Help : Help on APL language : System Functions & Variables : ŒERX Error trapping

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