GAMS World Forum

Hi Viktor, I am sorry to hear that! We saw the same problem on some Fedora version in the past, but this got resolved by now. Back than this was caused by some AppImage incompatibility and the workaround was to compile Studio yourself on your platform and not to use the AppImage we provide. Is that ...

Hi,

Have a look at the "miptrace" option of GAMS/Cplex: https://www.gams.com/latest/docs/S_CPLE ... EXmiptrace

Best regards,
Lutz

Hi,

This is currently not possible in Studio, but it is on the list for future improvements.

Here is some general information about changing the default solver: https://support.gams.com/solver:changin ... ult_solver

Best regards,
Lutz

Hi,

As the error message indicates, you get the problem, since GAMS does not know the dimension of the symbol "sec" in your code. You can set it, for example, in the declaration like this to define "sec" as one dimensional set:
Hope that helps,
Lutz

Renger,

In general the system.empty is used to initialize an empty set and set its dimension (1 in this example) at the same time. But you are right, that it is actually not needed in this example.

Best regards,
Lutz

Hi alodder, This is an excellent example for the use of the new GAMS feature called "implicit set definition": Sets food fruit(food<) / apple, orange / $onMulti veggie(food<) / carrot, tomato / ; Parameters FruitCost(fruit) / apple .99 orange .89 / VeggieCost(veggie) / tomato .63 carrot .8...

Hi, This is clearly a bug in the system (it happens with all settings for .pc which add quotes automatically). As a workaround you could set .pc=2 before the rename and set it back to 5 afterwards (note that I also used yearSim.tl in the rename command to actually generate different files, before yo...

Hi,

if it is about getting the values into the right place, you might want to use the "merge" option of gdxxrw, like described here: https://www.gams.com/latest/docs/T_GDXX ... HEET_MERGE

Best,
Lutz

Hi, I found a few (formatting) problems in your emp.info file: - You missed a line break before the last line - traffic_sc does not exist in the model, you should not mention it as stage 2 symbol - You did not name the random variables in the loop, but put in some numbers instead According to these ...

Hi, You can try something like this: Set scen /s1*s5/; Parameter Dataset(scen) / s1 1.2 s2 3.4 s3 5.6 s4 7.8 s5 9.0 /; Scalar a,scenToPick; scenToPick = uniformInt(1,card(scen)); a = sum(scen$(ord(scen)=scenToPick),Dataset(scen)); Display scenToPick, a; scenToPick = uniformInt(1,card(scen)); a = sum...