GAMS World Forum

Hi Shaparak, Not sure what you want to achieve, but you might want to free the attack variable again after the solve, that way the variable only is fixed for the index i it is currently looping over. Regards, GFA loop(i, attack.fx(i)=0; solve T maximizing o using mip; attack.lo(i) = -inf; attack.up(...

Hi lpedauga, Didn't test it but looking at your code there seems to be an error in you mapping. In the SAM you refer to "ctry2.nace1" "ctry2.nace2" and "ctry2.nace3" however there is no mapping in "map", I guess the numbers in red (see below) have to be a 2? R...

Hi Pitters, Somethings which might be useful: - Inside your table you can write m1*m3 to refer to all set-elements, this way the parameter will have the same value for all materials for the specific country. - Which comes down to the same as: ' tariff("c1",materials) = 10; ' which will als...

Hi, B(z+1) is declared in the same loop as u2(zz), so in the last loop iteration B(z+1) will have a value (772) but u2+1 won't. One way to solve this is to declare u2(zz+1) in the same loop, but keep in mind that now you will miss the first value of u2(zz), but just like the first b-value you can al...

I assume you mean your algorithm in Matlab? I'm sure Matlab has some functionality to write .txt-files in which you could put the right set order after the algorithm is finished. Then you can include that file in your GAMS code to use this set order. So Matlab txt-file contains for example: 3,2,1 An...

Hi,

At the start of your GAMS-code you could define a set that orders set elements (eg "set setord /3,2,1/;), this way every time these set-elements will be presented they will be ordered this way.
Downside is that you have to update this setord-list if your set-elements change..

Cheers,
GFA

Hi, Have a look at: https://www.gams.com/33/docs/UG_Equations.html " Indexed Equations". You might need this addition: LOKAL (J) .. X(J)=E= X(J-1)+(N(J)- S(J)); By the way, in the display-statement referencing to indices is not needed. Also, when displaying variables you need to state the ...

This should work:
Or this:
GFA

Hi zhj0735, Use $ifthen E for numerical expressions, also see: https://www.gams.com/mccarlGuide/ifthen_iftheni_ifthene_conditi.htm This seems to work but I'm not sure if it is the most elegant solution: $ifThene.cl %iclone%<>1 $ifThen.cl2 %random%==R display a; $endif.cl2 $endif.cl Regards, GFA

Hi Afccruz, Didn't test it but looking at your code I think you need to provide a sheetname for set "i" in ficheiroteste.txt (like you did for the Dst parameter, sheet DistanceDur): rng= <sheetname> !a1 You can also write a log-file of the GDXXRW call which may give you some hints: $call G...