[Cbc] Increase number of digits in solution file

Wed Oct 4 05:57:27 EDT 2017

Thank you very much.
It works perfectly !

Nicolas

De : John Forrest [mailto:john.forrest at fastercoin.com]
Envoyé : mercredi 4 octobre 2017 10:19
À : Derhy Nicolas (ENGIE SA) <nicolas.derhy at engie.com>
Cc : cbc at list.coin-or.org
Objet : Re: [Cbc] Increase number of digits in solution file

Nicolas,

Give up and do it the incorrect way.  Don't try and define CLP_OUTPUT_FORMAT.

Go to line 58 (about) in CbcSolver.cpp and change the line

#define CLP_OUTPUT_FORMAT %15.8g

to whatever you want.

John Forrest

On 03/10/17 14:01, nicolas.derhy at engie.com<mailto:nicolas.derhy at engie.com> wrote:
Hi,

I followed your advice and I tried to add  #define CLP_OUTPUT_FORMAT  "%20.12g" in Clp/src/config_default.h but it has no effect.
Then I tried to change compile parameters but did not know exactly what to do : I modified preprocessor definitions by adding CLP_OUTPUT_FORMAT=%20.12g; but no effect.
I tried with quote (CLP_OUTPUT_FORMAT=”%20.12g”;), I tried on different vs projects (cbc, libCbc and libClp) but it was unsuccessful…
When I watch the resulting command line, it seems that percent symbol is not well recognized because I obtain : /D "CLP_OUTPUT_FORMAT=\" .12g\""

If anyone can give me more details, it would be great !

Nicolas

De : Fausto Richetti Blanco [mailto:fausto.blanco at gmail.com]
Envoyé : jeudi 21 septembre 2017 18:59
À : John Forrest <john.forrest at fastercoin.com><mailto:john.forrest at fastercoin.com>
Cc : Derhy Nicolas (ENGIE SA) <nicolas.derhy at engie.com><mailto:nicolas.derhy at engie.com>; cbc <cbc at list.coin-or.org><mailto:cbc at list.coin-or.org>
Objet : Re: [Cbc] Increase number of digits in solution file

I think you can add -DCLP_OUTPUT_FORMAT ="%20.12g" to the compiler parameters in the project settings of visual studio

On Thu, Sep 21, 2017 at 1:05 PM, John Forrest <john.forrest at fastercoin.com<mailto:john.forrest at fastercoin.com>> wrote:
Nicolas,

I only use Linux, so maybe someone else can help.

I think that for Visual Studio you have to modify Clp/src/config_default.h by hand.  If so then I would try adding  #define CLP_OUTPUT_FORMAT ="%20.12g".  I am not sure if you need the "".  I hope someone will correct me if I am wrong.

John Forrest
On 21/09/17 14:24, nicolas.derhy at engie.com<mailto:nicolas.derhy at engie.com> wrote:
Hi John,

Can you explain me how to do this ?
I have downloaded source code and I compiled it successfully (using Visual Studio 2010).
I found some CXXDEFS in the configure file but I do not know what to modify.

Nicolas

De : Cbc [mailto:cbc-bounces at coin-or.org] De la part de John Forrest
Envoyé : mardi 19 septembre 2017 18:57
À : cbc at list.coin-or.org<mailto:cbc at list.coin-or.org>
Objet : Re: [Cbc] Increase number of digits in solution file

Nicolas,

When you configure cbc add to CXXDEFS

-DCLP_OUTPUT_FORMAT ="%20.12g"

or whatever you want.

John Forrest

On 19/09/17 16:02, nicolas.derhy at engie.com<mailto:nicolas.derhy at engie.com> wrote:
Hi everybody,

I often use cbc exe. It works very well and each time I use it, I add to the command line “-solution mySolution.txt” in order to recuperate the optimal solution.
My problem is that the values stored in the solution file lacked sometimes of precision when I need a lot of digits.
For example, I recently obtained 1.5596969e+008 whereas I was hoping for  155969687.

I tried several options like –output but I did not find any option that will fit my expectations.
Is there a way to increase the number of digits in solution file ?

Nicolas

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