Re : Novice struggling with a "Set Already Under Control" error

GAMS
1

yeah! i think youjust needed to rename the set c
find the code below
SET c chemical /c1*c20/ ;
alias (c, cc);
PARAMETER heat(c) heat Values
/ c1 2.45, c2 1.32, c3 1.23, c4 4.21, c5 2.83,
c6 1.92, c7 2.2, c8 6.69, c9 3.67, c10 1.28,
c11 2.45, c12 3.33, c13 3.27, c14 1.91, c15 2.32,
c16 2.82, c17 1.72, c18 2.62, c19 2.72, c20 1.77/;
POSITIVE VARIABLES
mixpercent(c) Mixing percentages associated with chemicals ;
FREE VARIABLE
mixheat Objective to minimize ;
EQUATIONS
maxlimit(c) Limit of % of any one chemical
mixlimit(c) Limit on mix percentage
mixobj Objective function
;

  • No chemical can be more than 20% of mix
    maxlimit(c)… mixpercent(c) =l= 0.2;
  • The sum of all the mixing percentages must be less or equal to 50%
    mixlimit(c)… sum(cc, mixpercent(cc)) =e= 0.5;
    **** $125 Set is under control already
  • Objective to minimize total heat of mix
    mixobj… mixheat =e= sum(c, heat(c)*mixpercent(c));
    MODEL mix /ALL/;
    SOLVE mix using LP minimizing mixheat;
    display mixpercent.l;



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M. Hervé Jean-Louis GUENE
Ingénieur Statisticien - Economiste
Service du Suivi de la Paurevté (Insitut National de la Statistique et de la Démographie)
cel:(+226) 78 35 77 76/ 71 31 53 52




— En date de : Lun 14.3.11, Lynn a écrit :


De: Lynn
Objet: Novice struggling with a “Set Already Under Control” error
À: “gamsworld”
Date: Lundi 14 mars 2011, 16h47

Hello everyone. I am a novice at GAMS and am struggling with which
may be a simple error. I have looked at sample code and still dont
understand what I am doing wrong. Here is the code snippit with my
error inserted. Any advice and reason why I am getting the error is
greatly appreciated.


SET c chemical /c1*c20/

PARAMETER heat(c) heat Values
/ c1 2.45, c2 1.32, c3 1.23, c4 4.21, c5 2.83,
c6 1.92, c7 2.2, c8 6.69, c9 3.67, c10 1.28,
c11 2.45, c12 3.33, c13 3.27, c14 1.91, c15 2.32,
c16 2.82, c17 1.72, c18 2.62, c19 2.72, c20 1.77/;

POSITIVE VARIABLES
mixpercent(c) Mixing percentages associated with chemicals

FREE VARIABLE
mixheat Objective to minimize

EQUATIONS
maxlimit(c) Limit of % of any one chemical
mixlimit(c) Limit on mix percentage
mixobj Objective function
;

  • No chemical can be more than 20% of mix
    maxlimit(c)… mixpercent(c) =l= 0.2;

  • The sum of all the mixing percentages must be less or equal to 50%
    mixlimit(c)… sum(c, mixpercent(c)) =e= 0.5;

**** $125 Set is under control already

  • Objective to minimize total heat of mix
    mixobj… mixheat =e= sum(c, heat(c)*mixpercent(c));

MODEL mix /ALL/;
SOLVE mix using LP minimizing mixheat;

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2

Herve,

Thanks that worked but unsure why that was required. I will research
alias’ and see what I can learn.

Thanks again!

On Mar 14, 12:50 pm, herve guene wrote:

yeah! i think youjust needed to rename the set c
find the code below
SET c chemical /c1*c20/ ;
alias (c, cc);
PARAMETER heat(c) heat Values
/ c1 2.45, c2 1.32, c3 1.23, c4 4.21, c5 2.83,
c6 1.92, c7 2.2, c8 6.69, c9 3.67, c10 1.28,
c11 2.45, c12 3.33, c13 3.27, c14 1.91, c15 2.32,
c16 2.82, c17 1.72, c18 2.62, c19 2.72, c20 1.77/;
POSITIVE VARIABLES
mixpercent(c) Mixing percentages associated with chemicals ;
FREE VARIABLE
mixheat Objective to minimize ;
EQUATIONS
maxlimit(c) Limit of % of any one chemical
mixlimit(c) Limit on mix percentage
mixobj Objective function
;

  • No chemical can be more than 20% of mix
    maxlimit(c)… mixpercent(c) =l= 0.2;
  • The sum of all the mixing percentages must be less or equal to 50%
    mixlimit(c)… sum(cc, mixpercent(cc)) =e= 0.5;
    **** $125 Set is under control already
  • Objective to minimize total heat of mix
    mixobj… mixheat =e= sum(c, heat(c)*mixpercent(c));
    MODEL mix /ALL/;
    SOLVE mix using LP minimizing mixheat;
    display mixpercent.l;

M. Hervé Jean-Louis GUENE
Ingénieur Statisticien - Economiste
Service du Suivi de la Paurevté (Insitut National de la Statistique et de la Démographie)
cel:(+226) 78 35 77 76/ 71 31 53 52

— En date de : Lun 14.3.11, Lynn a écrit :

De: Lynn
Objet: Novice struggling with a “Set Already Under Control” error
À: “gamsworld”
Date: Lundi 14 mars 2011, 16h47

Hello everyone. I am a novice at GAMS and am struggling with which
may be a simple error. I have looked at sample code and still dont
understand what I am doing wrong. Here is the code snippit with my
error inserted. Any advice and reason why I am getting the error is
greatly appreciated.

SET c chemical /c1*c20/

PARAMETER heat(c) heat Values
/ c1 2.45, c2 1.32, c3 1.23, c4 4.21, c5 2.83,
c6 1.92, c7 2.2, c8 6.69, c9 3.67, c10 1.28,
c11 2.45, c12 3.33, c13 3.27, c14 1.91, c15 2.32,
c16 2.82, c17 1.72, c18 2.62, c19 2.72, c20 1.77/;

POSITIVE VARIABLES
mixpercent(c) Mixing percentages associated with chemicals

FREE VARIABLE
mixheat Objective to minimize

EQUATIONS
maxlimit(c) Limit of % of any one chemical
mixlimit(c) Limit on mix percentage
mixobj Objective function
;

  • No chemical can be more than 20% of mix
    maxlimit(c)… mixpercent(c) =l= 0.2;

  • The sum of all the mixing percentages must be less or equal to 50%
    mixlimit(c)… sum(c, mixpercent(c)) =e= 0.5;

**** $125 Set is under control already

  • Objective to minimize total heat of mix
    mixobj… mixheat =e= sum(c, heat(c)*mixpercent(c));

MODEL mix /ALL/;
SOLVE mix using LP minimizing mixheat;

–
To post to this group, send email to gamsworld@googlegroups.com.
To unsubscribe from this group, send email to gamsworld+unsubscribe@googlegroups.com.
For more options, visit this group athttp://groups.google.com/group/gamsworld?hl=en.

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