GAMS World Forum

Dear All,

is there anyone know if GAMS has syntax for Multiparametric programming?

Thanks

Dear Bussieck,

Could you please give me an example for the term you mentioned " The relaxation method (I used Cplex option "feasopt 1") ". It would be very helpful for me if you could reproduce it in existing code above.

Thanks !!!

p.xlsx Hi dasa, See code below, should be working with attached XLSX. Made some small changes, but most important is that every dimension needs its own column/row in Excel. Regards, GFA set m /1*3/; alias (m,n); parameter g(*,*,*) ; $onecho> p.txt Par=g rng=S1!B4:E7 rdim=2 cdim=1 $offecho $call GDX...

Dear all, Instead of writing table g (as you can see in the code) in gams, i wanna load it from excel. set m /1*3/; alias (m,n); Table g(m,n,*) a b 1.2 0.00375 0.00275 1.3 0.00375 0.0035 2.3 0.001875 0.0015 ; I have written some code. however, it doesn't work. Could someone modify or give me some id...

Hi The trick is to keep the loop index out of the model equations and assign values to parameters used in the equations within the loop: set t /1*5/ m /1*3/ alias(m,n); set conex(m,n) /1.2,1.3,2.3/; conex(m,n)$(conex(n,m))=1; ; parameter a(m) /1 2,2 3/; parameter b(m) /1 5,2 4.5/; variables Pm(t),z...

set t /1*5/ m /1*2/; parameter a(m) /1 2,2 3/; parameter b(m) /1 5,2 4.5/; variables Pm(t),z; parameter am, bm, resultsm, resultsmt; equation o1, c1, c2; o1.. z =e= am*sum(t,Pm(t))+bm; c1(t).. Pm(t) =l= 5; c2(t).. Pm(t) =g= 0; model gg /all/; loop(m, am = a(m); bm = b(m); solve gg using lp minimiza...

set t /1*5/ m /1*2/; parameter a(m) /1 2,2 3/; parameter b(m) /1 5,2 4.5/; variables Pm(t),z; parameter am, bm, resultsm, resultsmt; equation o1, c1, c2; o1.. z =e= am*sum(t,Pm(t))+bm; c1(t).. Pm(t) =l= 5; c2(t).. Pm(t) =g= 0; model gg /all/; loop(m, am = a(m); bm = b(m); solve gg using lp minimiza...

Hi It is not clear from your post what you intend to do. You assign the value of a variable to another variable before you solved the model (Pm(t) = P(m,t)) in a loop over m which also doesn't make sense. Pm(t) would get the value of the last m. CHeers Renger Hello, Thanks for your feedback. what i...

Hi You should rewrite the set j from your model and treat the variables and parameters independent of j. Here an example: set j /1*2/; parameter p(j) Parameter defined over j, pj Scalar to be used in the loop to replace p; p(j) = ord(j); variable OBJ,X; equation objective, eq1; objective.. OBJ =E= ...

Dear all, I have some problem related to iterate until converge. I understand that for 1 condition, it could be written as : .... Parameter converged; Converged=0; loop(iter$(not converged), statement … A= abs(UB-LB); converged$(A <= 0.01) = 1; ); However, what should I code if there are several con...