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Re: How to determine whether a message has been switched

• To: mathgroup at smc.vnet.net
• Subject: [mg71502] Re: How to determine whether a message has been switched
• From: David Bailey <dave at Remove_Thisdbailey.co.uk>
• Date: Mon, 20 Nov 2006 18:12:05 -0500 (EST)
• Organization: Customer of PlusNet plc (http://www.plus.net)
• References: <200611190610.BAA23575@smc.vnet.net> <ejrn2r$98u$1@smc.vnet.net>

Carl Woll wrote:
> Andrew Moylan wrote:
> 
>> Hi all,
>>
>> When writing algorithms, I sometimes decide to disable a particular
>> message using the function Off[]. At the end of my routine, I re-enable
>> the message using the function On[].
>>
>> Unfortunantely, if the message in question has already been turned off
>> (by some other function, for example), then my code will have the
>> unfortunate side-effect of switching it back on. What I really want is
>> to disable the message for the duration of my routine, and then set it
>> back to its original state at the end of my routine.
>>
>> Thus: Is there some way to determine whether a message has been
>> switched Off[] (or On[])?
>>
>> Cheers,
>> Andrew
>>  
>>
> Look at the message:
> 
> Off[General::spell1]
> 
> In[2]:=
> General::spell1
> Out[2]=
> $Off[Possible spelling error: new symbol name "`1`" is similar to existing \
> symbol "`2`".]
> 
> Messages that have been turned off are wrapped in $Off.
> 
> Carl Woll
> Wolfram Research
> 
Carl,

Don't you think information like that should be documented! If you look 
up the symbol $Off, it is there, but with no help information at all!

David Bailey
http://www.dbaileyconsultancy.co.uk

• References:
  • How to determine whether a message has been switched off?
    • From: "Andrew Moylan" <andrew.j.moylan@gmail.com>