Re: [eclipse-clp-users] Eplex message "Cbc3007W No integer variables - nothing to do": How to get rid of?

Ulrich Scholz wrote:
> Dear all,
> 
> I use the eplex_osi_clpcbc library to build Integer optimization problems
> with decision variables dynamically.  It works well (and fast) but for the
> smaller problems I get the warning messages 
> 
>  Cbc3007W No integer variables - nothing to do
>  Cbc3007W No integer variables - nothing to do
> 
> These are always two lines.  What is causing them?  How to get rid of them?
> 
> My guess is that the small problems are "too simple" and there is no search.
> The larger ones don't show the messages.
> 
> 
> Thanks, Ulrich
> 
> 
> PS. Two small comments: The explanation of "++X" in the Terminology section
> of the User Manual has a bug.  And I consider the explanation of the
> creation of dynamic solver instances confusing: Maybe you should mention
> that to reuse the atom (e.g., the one unified with Pool in the second
> example of 9.3.2) you need to use eplex_cleanup/0.

Hi Ulrich,

The messages comes from Cbc, and not eplex. We don't have any good 
control over what messages the external solver may generate. In the case 
of Cbc/Clp, eplex already specify that it wants the lowest level above 
no output (i.e. least amount) of messages from the solvers.

If you really want to get rid of them, you can supress the printing of 
warning messages by supressing the warning_channel from the solver (this 
is described in the `External Solver Output and Log' section of the 
Constraints Library manual). However, this is *not* recommended, as you 
probably want to see `real' warning messages from the solver.


Cheers,

Kish



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