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Re: Stop on message?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg126769] Re: Stop on message?
  • From: Ralph Dratman <ralph.dratman at gmail.com>
  • Date: Wed, 6 Jun 2012 04:52:54 -0400 (EDT)
  • Delivered-to: l-mathgroup@mail-archive0.wolfram.com
  • References: <201205260911.FAA07083@smc.vnet.net>

Re: the recent "stop on message" discussion. The earlier-posted
solution from StackExchange suggests adding the following to the top
of a notebook:
- - - - - - - - - -
messageHandler = If[Last[#], Abort[]] &
Internal`AddHandler["Message", messageHandler]
(* The above will abort the computation whenever a message would be printed=
. *)
(* It can be turned off using*)
(* Internal`RemoveHandler["Message", messageHandler] *)
- - - - - - - - - -
This helps, and seems to prevent a complete freeze, but it does not
always terminate the evaluation immediately. The Abort call seems to
wait for something to finish before stopping everything.

>From prior experience, I knew that Interrupt works more quickly than
Abort. I realize this seems a little bit illogical, but nevertheless,
that is my observation: Interrupt gets you out of trouble instantly,
while Abort often doesn't.

I substituted Interrupt in the handler, with much better results, as follow=
s:
- - - - - - - - - -
(* ----- proposed new version ----- *)
messageHandler = If[Last[#], Interrupt[]] &
Internal`AddHandler["Message", messageHandler]
(* The above will immediately (!) put up an Abort dialog offering to *)
(* end the evaluation whenever an enabled message is issued. *)
(* It can be turned off using *)
(* Internal`RemoveHandler["Message", messageHandler] *)
- - - - - - - - - -
This tiny enhancement to Mathematica has proved amazingly helpful, and
I hope everyone will try it. It is a relief not to be always
anticipating the next messy crash.

Let me know if you have any additions or corrections.

Ralph Dratman


On Tue, May 29, 2012 at 5:47 AM, Szabolcs Horv=E1t <szhorvat at gmail.com> wro=
te:
> Please see here for a method that will reliably abort immediately when a
> message is generated.
> http://mathematica.stackexchange.com/questions/1512/how-to-abort-on-any-m=
essage-generated



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