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Re: OnError [Thread"::"tdlen"]

  • To: mathgroup at smc.vnet.net
  • Subject: [mg132567] Re: OnError [Thread"::"tdlen"]
  • From: Bob Hanlon <hanlonr357 at gmail.com>
  • Date: Sat, 12 Apr 2014 05:16:19 -0400 (EDT)
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  • References: <20140411061209.CF9E86A3F@smc.vnet.net>

"Check[expr, failexpr] evaluates expr, and returns the result, unless
messages were generated, in which case it evaluates and returns failexpr. "


Bob Hanlon



On Fri, Apr 11, 2014 at 2:12 AM, EMartin <eMartinSerrano at telefonica.net>wrote:

> Hi,
>
> Many classic  programming languages provide a command to interrupt
> computations when some exception arises, allowing to perform any action on
> the exception as in something as, for example:
>
> OnError [] do (action)] [routine]  (*This could be the general pattern*)
>
> OnError [] do (Print[Stack]; Abort[] ) [routine] (*This could be a more
> specific pattern*)
>
> OnError [Thread"::"tdlen"] do JumpToCheck ][routine]
>
> (*The above could be a more specific but even more general pattern. The
> jump
> made to an exception handling routine to evaluate or treat the exception*)
>
>
>
> These catching commands should be located  at the beginning of the whole
> code as in *TimeConstrained[routine, time]* which aborts the  routine if it
> takes more than time seconds.
>
>
>
> Mathematica has got enough stuff to deal with erroneous situation (Abort,
> Interrupt, Catch, Throw,=85) provided one is able to catch the exception
> (and
> its type) as soon as it arises , but I never was able to do it.
>
>
>
> Since Mathematica prints the errors messages, the type of the exception and
> the exact point where it arises is available (but hidden) to let the user
> to
> take control. Probably the tool is already available but I can find it.
>
>
>
> Any help will be welcome
>
>
>
> E. Martin-Serrano
>
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