[Scip] Interpretation of solution file from SCIP: missing variables and

[Ramón Casero Cañas]

Hi Felipe,

Thanks for your reply. I need to fix my code. I was treating missing
variables as NaNs, to detect them as an error. Easy fix, though!

Best regards,

Ramon.
On 27 Feb 2014 01:11, "Felipe Serrano" <fserranom5 at gmail.com> wrote:

> Hi Ramon
>
> Variables which optimal value is 0, are not displayed.
> The nlreform variables, are variables created to handle the nonlinear
> constraints, I guess you can ignore them.
>
> Best,
> Felipe
>
>
>
> On Thu, Feb 27, 2014 at 1:40 AM, Ramón Casero Cañas <rcasero at gmail.com>wrote:
>
>> Dear all,
>>
>> So thanks to your help and the documentation, I have been able to
>> write my problem to a PIP file, call the SCIP binary from Matlab
>> (scip-3.0.2.linux.x86_64.gnu.opt.spx), solve the problem until it
>> finds 1 valid solution, write the solution to a file, and read it back
>> into Matlab.
>>
>> I have variables
>>
>> x1
>> y1
>> z1
>> ...
>> x4574
>> y4574
>> z4574
>>
>> both in the objective function and constraints.
>>
>> SCIP runs for a while, finds a solution, and writes its to a file. It
>> seems that I have variables missing in the solution
>>
>> solution status: solution limit reached
>> objective value:                    -760.711552889581
>> x1                                   0.44337718267988   (obj:0)
>> y1                                  -1.11537963003733   (obj:0)
>> z1                                  0.640066367478129   (obj:0)
>> x2                                  0.635593926577552   (obj:0)
>> y2                                  0.405953492189133   (obj:0)
>> z2                                   1.13206100660573   (obj:0)
>> ...
>> x20                                 0.225420591151844   (obj:0)
>> y20                                  1.33025644597009   (obj:0)
>> z20                                  0.17304145468582   (obj:0)
>> y21                                  1.09858400598118   (obj:0)
>> x22                                 0.042773405539517   (obj:0)
>> y22                                  1.05348001958397   (obj:0)
>> y23                                 0.715794911501469   (obj:0)
>> ...
>>
>> Note how e.g. x21, z21 and z22 are missing here (and they are not
>> elsewhere in the file either). Is this expected behaviour?
>>
>> In addition, the solutions file has at the end lines like:
>>
>> quadobjvar                          -760.711552889581   (obj:1)
>> nlreform0                           0.820888812661168   (obj:0)
>> nlreform1                           0.777248902182625   (obj:0)
>> nlreform2                          -0.189610104867685   (obj:0)
>> nlreform3                         -0.0728986988897996   (obj:0)
>> ...
>>
>> What are those for? I did an online search, but could only find where
>> nlreform is coded in SCIP, not what it means.
>>
>> Best regards,
>>
>> Ramon.
>>
>> --
>> Dr. Ramón Casero Cañas
>>
>> Oxford e-Research Centre (OeRC)
>> University of Oxford
>> 7 Keble Rd
>> Oxford OX1 3QG
>>
>> tlf     +44 (0) 1865 610739
>> web     http://www.cs.ox.ac.uk/people/Ramon.CaseroCanas
>> photos  http://www.flickr.com/photos/rcasero/
>>
>> _______________________________________________
>> Scip mailing list
>> Scip at zib.de
>> http://listserv.zib.de/mailman/listinfo/scip
>>
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://listserv.zib.de/pipermail/scip/attachments/20140227/f4cda938/attachment.html>