[Scip] Define parameters in ZIMPL
Julio Rojas
jcredberry at gmail.com
Sun May 16 10:53:55 MEST 2010
We're almost there, I think... I mistakingly put:
par s[<i,j> in e2] := <1,2> 1, <1,3> 2, ... , <n-1,n> (n^2 - n)/2;
when it should have been something like:
par s[<i,j> in e2] := <1,2> p[1], <1,3> p[2], ... , <n-1,n> p[(n^2 - n)/2];
is it possible by changing your code to:
par s[<i,j> in e2] := <i,j> p[( ((i -1)* card(p) + (j-1))^2 - ((i
-1)*card(p) + (j-1))) / 2];
or something like that?
Best regards.
-------------------------------------------------
Julio Rojas
jcredberry at gmail.com
On Sun, May 16, 2010 at 10:31 AM, Thorsten Koch <koch at zib.de> wrote:
> Am 16.05.2010 10:20, schrieb Julio Rojas:
> > Dear Thornsten, I'm sorry for my lack of clarity. What I would like is to
> > fill position <i,j> of the parameter matrix "s" with position <k> of a
> > vector or set of values.
>
> But you need some connect betwwen i,j and k or should k just be
> incremented?
>
>
>
> I would really like to learn how to solve it
> > directly in ZIMPL, as the regular way of doing it would require using two
> > (very costly in time) loops that build the string "par s[<i,j> in e2] :=
> > <1,2> 1, <1,3> 2, ... , <n-1,n> (n^2 - n)/2;
>
> That would be:
>
> par s[<i,j> in e2] := <i,j>( ((i -1)* card(p) + (j-1))^2 - ((i -1)*
> card(p) + (j-1))) / 2;
>
> Best regards,
> Thorsten
>
> >
> > If there's no possible way, don't worry, I won't keep trying to pull a
> > Phillips screw with a flat screwdriver. ;) Besides, I have already solve
> it
> > from my source code without using the loops, although
> > curiosity still lingers on. I hope
> >
> > I have been sufficiently clear. Best regards.
> > -------------------------------------------------
> > Julio Rojas
> > jcredberry at gmail.com
> >
> >
> > On Sun, May 16, 2010 at 12:21 AM, Thorsten Koch <koch at zib.de> wrote:
> >
> >> Dear Julio,
> >>
> >> it is not clera to what you want to achieve.
> >>
> >> Am 15.05.2010 16:38, schrieb Julio Rojas:
> >>> Dear Thorsten, I have followed your advice and changed my code to:
> >>>
> >>> param s[<i,j> in e2] := ord(p,j in {1..card(p)},1) default 0;
> >>>
> >>
> >> s[3,4] has to resolve to a single number.
> >>
> >> What do you want from the j in { 1 .. 3 } ?
> >> j is already fixed from the s[<i,j> in e2] so it is some number.
> >> But then 2 in { 1 .. 3} does not make much sense.
> >>
> >> Best regards,
> >> Thorsten
> >>
> >>
> >>
> >>> Now, the error changed to:
> >>>
> >>> Reading problem.zpl
> >>> *** Error 800: File problem.zpl Line 7 : syntax error, unexpected IN,
> >>> expecting
> >>> ',' or '+' or '-'
> >>> *** aram s[<i,j> in e2] := ord(p,k in {1..card(p)},1) default 0;
> >>> *** ^^^
> >>>
> >>> Any other idea? Am I forcing things and should stick to define the
> >>> parameters by hand from my program (two loops)?
> >>>
> >>> Best regards.
> >>> -------------------------------------------------
> >>> Julio Rojas
> >>> jcredberry at gmail.com
> >>>
> >>>
> >>> On Sat, May 15, 2010 at 3:35 PM, Thorsten Koch <koch at zib.de> wrote:
> >>>
> >>>> Dear Julio,
> >>>>
> >>>> you can not access a member of a set (p) by use of [].
> >>>> if you do p[] you try to access an array of sets (which is not defined
> >>>> in this case)
> >>>> You can access a member of a set using the ord() function.
> >>>>
> >>>> Furthermore, a parameter is always only a single value.
> >>>>
> >>>> Here
> >>>>> param s[<i,j> in e2] := p[i in {1..card(p)}] default 0;
> >>>> ^
> >>>> This i
> >>>> is equal to the i from <i,j>.
> >>>> The expression on the right hand side is not depending on j.
> >>>> In any case it should read p[<i> in ... but this won't work either.
> >>>>
> >>>> But I believe ord() will do what you need.
> >>>>
> >>>> Best regards,
> >>>> Thorsten
> >>>>
> >>>>
> >>>> param s[<i,j> in e2] := ord(p([i in {1..card(p)}] default 0;
> >>>>
> >>>> Am 14.05.2010 20:18, schrieb Julio Rojas:
> >>>>> Dear Armin and Ambros, not really. I'll like to put the k-th element
> of
> >>>> the
> >>>>> set p in the <i,j>-th position of the parameter matrix s. I have
> >> already
> >>>>> defined e2 (but didn't put it in my previous email) and I wouldn't
> like
> >>>> to
> >>>>> create the matrix of parameters one by one as it is stated in the
> >> manual.
> >>>>> The matrix s is a triangular matrix with zeros in the diagonal (in
> >>>> reality
> >>>>> is a distance matrix). I would like to fill each element of the
> matrix
> >>>> from
> >>>>> a set. This way I will not have to make a double loop in my code to
> >>>> define
> >>>>> each element <i,j> with i<j. This is the code I already have:
> >>>>>
> >>>>> set nodes := {"1","2","3"};
> >>>>> set e2 := {<i,j> in nodes*nodes with i<j};
> >>>>> set p := {.1,.2,.3};
> >>>>> var y[<i,j> in e2] binary;
> >>>>> var x[<i> in nodes] binary;
> >>>>> param s[<i,j> in e2] := p[i in {1..card(p)}] default 0;
> >>>>> maximize sim: sum<i,j> in e2: s[i,j]*y[i,j];
> >>>>>
> >>>>> Best regards.
> >>>>> -------------------------------------------------
> >>>>> Julio Rojas
> >>>>> jcredberry at gmail.com
> >>>>>
> >>>>>
> >>>>> 2010/5/14 Armin Fügenschuh <fuegenschuh at zib.de>
> >>>>>
> >>>>>> Dear Julio,
> >>>>>>
> >>>>>> is this the thing you're trying to do?
> >>>>>>
> >>>>>> set p := {.1,.2,.3};
> >>>>>> set e2 := p*p;
> >>>>>> param s[<i,j> in e2] := j;
> >>>>>> var y[e2] real;
> >>>>>> maximize sim: sum<i,j> in e2: s[i,j]*y[i,j];
> >>>>>>
> >>>>>>
> >>>>>> Regards,
> >>>>>> Armin
> >>>>>>
> >>>>>>
> >>>>>> 2010/5/14 Julio Rojas <jcredberry at gmail.com>
> >>>>>>
> >>>>>>> Dear all, I would like to define the matrix of parameters from a
> set.
> >> I
> >>>>>>> have tried with the following:
> >>>>>>>
> >>>>>>> set p := {.1,.2,.3};
> >>>>>>> param s[<i,j> in e2] := p[i in {1..card(p)}] default 0;
> >>>>>>> maximize sim: sum<i,j> in e2: s[i,j]*y[i,j];
> >>>>>>>
> >>>>>>> The following message appears:
> >>>>>>>
> >>>>>>> *** Error 800: File problem.zpl Line 7 : syntax error, unexpected
> >>>> SETSYM
> >>>>>>> *** param s[<i,j> in e2] := p[<i> in {1..card(p)}] default 0;
> >>>>>>> *** ^^^
> >>>>>>>
> >>>>>>> Is there a way to do this? Thanks in advance.
> >>>>>>> -------------------------------------------------
> >>>>>>> Julio Rojas
> >>>>>>> jcredberry at gmail.com
> >>>>>>>
> >>>>>>>
> >>>>>>> _______________________________________________
> >>>>>>> Scip mailing list
> >>>>>>> Scip at zib.de
> >>>>>>> http://listserv.zib.de/mailman/listinfo/scip
> >>>>>>>
> >>>>>>>
> >>>>>>
> >>>>>>
> >>>>>> --
> >>>>>>
> >>>>>> Dr. Armin Fügenschuh
> >>>>>>
> >>>>>> Konrad-Zuse-Zentrum für
> >>>>>> Informationstechnik Berlin (ZIB)
> >>>>>>
> >>>>>> Division Scientific Computing
> >>>>>> Department Optimization
> >>>>>>
> >>>>>> Takustrasse 7
> >>>>>> 14195 Berlin
> >>>>>>
> >>>>>> Tel. : +49 (0)30 84185-205
> >>>>>> Fax: +49 (0)30 84185-269
> >>>>>> email: fuegenschuh at zib.de
> >>>>>>
> >>>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>> _______________________________________________
> >>>>> Scip mailing list
> >>>>> Scip at zib.de
> >>>>> http://listserv.zib.de/mailman/listinfo/scip
> >>>>
> >>>> --
> >>>> The important thing is not to stop questioning.
> >>>> Curiosity has its own reason for existing. -- Albert Einstein
> >>>> ______________________________________________________________________
> >>>> Dr. Thorsten Koch / Konrad-Zuse-Zentrum für Informationstechnik Berlin
> >>>> www.zib.de/koch / Takustraße 7, 14195 Berlin-Dahlem,
> Germany
> >>>> koch at zib.de / Phone +49-30-84185-213, Fax
> -269
> >>>> _______________/ DFG Research Center "Matheon"
> http://www.matheon.de
> >>>>
> >>>> Kooperativer Bibliotheksverbund Berlin Brandenburg
> http://www.kobv.de
> >>>> ______________________________________________________________________
> >>>>
> >>>
> >>
> >> --
> >> The important thing is not to stop questioning.
> >> Curiosity has its own reason for existing. -- Albert Einstein
> >> ______________________________________________________________________
> >> Dr. Thorsten Koch / Konrad-Zuse-Zentrum für Informationstechnik Berlin
> >> www.zib.de/koch / Takustraße 7, 14195 Berlin-Dahlem, Germany
> >> koch at zib.de / Phone +49-30-84185-213, Fax -269
> >> _______________/ DFG Research Center "Matheon" http://www.matheon.de
> >>
> >> Kooperativer Bibliotheksverbund Berlin Brandenburg http://www.kobv.de
> >> ______________________________________________________________________
> >>
> >
>
> --
> The important thing is not to stop questioning.
> Curiosity has its own reason for existing. -- Albert Einstein
> ______________________________________________________________________
> Dr. Thorsten Koch / Konrad-Zuse-Zentrum für Informationstechnik Berlin
> www.zib.de/koch / Takustraße 7, 14195 Berlin-Dahlem, Germany
> koch at zib.de / Phone +49-30-84185-213, Fax -269
> _______________/ DFG Research Center "Matheon" http://www.matheon.de
>
> Kooperativer Bibliotheksverbund Berlin Brandenburg http://www.kobv.de
> ______________________________________________________________________
>
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