RE: Re: Check[] *and* Off[]

• To: mathgroup at smc.vnet.net
• Subject: [mg21915] RE: [mg21894] Re: Check[] *and* Off[]
• From: "Ersek, Ted R" <ErsekTR at navair.navy.mil>
• Date: Fri, 4 Feb 2000 02:54:44 -0500 (EST)
• Sender: owner-wri-mathgroup at wolfram.com

```Paul Howland wrote:
-------------------------------

Well... before anyone wastes their breath trying to answer my question
about whether it is possibly to "silently" trap an error message using
Check[], I have found the way to do it.  And it is trivial.  All you
need do is temporarily redefine the messages channel.

So, the answer is, do this:

messagechan=\$Messages; \$Messages={};
Check[myfunction[], myerrfunction[]];
\$Messages=messagechan;

--------------------

Block is designed for this sort of thing.
So the following does the same thing as your solution.

Block[ {\$Messages={}},
Check[myfunction, myerrfunction[] ]
]

Look up Block at my website for more applications of Block.
--------------------
Regards,
Ted Ersek

On 12-18-99 Mathematica tips, tricks at
http://www.dot.net.au/~elisha/ersek/Tricks.html
had a major update

-----Original Message-----
From: Paul Howland
To: mathgroup at smc.vnet.net
paul.howland at nc3a.nato.int
Subject: [mg21915] [mg21894] Re: Check[] *and* Off[]

Well... before anyone wastes their breath trying to answer my question
about whether it is possibly to "silently" trap an error message using
Check[], I have found the way to do it.  And it is trivial.  All you
need do is temporarily redefine the messages channel.

So, the answer is, do this:

messagechan=\$Messages; \$Messages={};
Check[myfunction[], myerrfunction[]];
\$Messages=messagechan;

and the screen no longer fills up with unwanted error messages.  The
only slight disadvantage of this approach is that *all* error messages
are lost, so if you are trying to Check[] for specific messages only,
then you won't see the messages you're not trapping.  I guess in this
situation you might want to re-direct \$Messages to a file instead.

Paul

```

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