Re: [eclipse-clp-users] 'Problem is infeasible!' in eplex goes to stdout

From: Kish Shen <>
Date: Sat, 16 Aug 2014 23:15:24 +0100
Hi Sergii,

On 16/08/2014 00:54, Sergii Dymchenko wrote:> Hi,
 > I've downloaded ECLiPSe version 6.1 #191 and now my programs that 
uses eplex
 > often output 'Problem is infeasible!' to stdout.

You did not say which solver you are using with eplex, but I assume you 
are using CLP/CBC. Is this correct?

> Could you make  'Problem is infeasible!' message go to warning stream so it
> can be silenced with `:- set_stream(warning_output, null).`?

No, ECLiPSe does not control where the solver send its messages, but the 
solver should not be sending anything directly to stdout, as its 
messages should be sent to the correct channel depending on the message 
type (error, warning, result, log). Could you please provide a simple 
example that produce this message (and could you also confirm the solver 
you are using), so that I can report the issue to the correct people 
(the developers of CLP/CBC, if this is the solver you are using).

By the way, it is a bad idea to suppress all warning_output output, as 
this is an ECLiPSe stream, and all ECLiPSe warnings are sent there, and 
ignoring warnings sent by ECLiPSe is generally a bad idea. If you want 
to suppress warnings from the solver, you should redirect the eplex 
warning_channel instead --

:- lp_set(warning_channel, -warning_output).

(see the documentation for lp_set/2 for more detail).


Received on Sat Aug 16 2014 - 22:15:36 CEST

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