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MathGroup Archive 2003

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Re: Detecting unsuccessful computations

  • To: mathgroup at smc.vnet.net
  • Subject: [mg39319] Re: Detecting unsuccessful computations
  • From: Mike Yukish <may106 at psu.edu>
  • Date: Tue, 11 Feb 2003 04:41:46 -0500 (EST)
  • Organization: Penn State University, Center for Academic Computing
  • References: <b27fn8$n9t$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Uri Zwick wrote:

> Hi,
>
> Mathematica functions such as LinearSolve, LinearProgramming,
> FindMinimum and many others, sometimes cannot perform the
> requested task. (The linear system of equations has no solution, the
> linear program has no feasible points, etc.)

<snip>

>
> What is the recommended way of calling a function like
> LinearProgramming and getting an indication that something
> went wrong, WITHOUT getting any error message printed?

Had just this problem myself. Solution for me is a two-parter. First, wrap
the FindMinimum[ ] code or other in a Check[ ] function, to act on the
error.

Second, wrap this in a Block that redirects the $Messages pipe temporarily.
So you get...

Block[{$Messages={},
    Check[
         FindMinimum[blah, blah, blah],
         OopsWhatToDoIfAnError[ ]
         ]
 ]

Read the Mathematica help on $Messages and on Check for more info






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