GAMS World Forum

Hi,
Thanks.
I tried something else to solve the problem, but they still didn't work.
Here is my code and data.
Best wishes!

Hi everyone, I am using GAMS to do a water resource allocation problem. There are two reservoirs (R1 and R2) to supply water to two water users (U1 and U2). The water supply cost of reservoir A is lower than that of reservoir B, but reservoir A needs to recharge by diversion, the cost of which is hi...

There are many good reasons to work with up-to-date software. You should consider to work with an up-to-date version of GAMS. The GMSPython of GAMS 25 probably did not come with pandas. There can be many different reasons why you get different objective functions (did you set optcr to 0?). I think ...

Hi, I had to adjust your path string not only to match my directory structure but also added the r for raw string (data_dir = r"D:\Users\mbussieck\Downloads\随机生成序列2/"). I could run the Python script okay. I don't know whay goes wrong. before the first solve, the update database contains a...

Hi, I try to use a GamsModelInstance to optimize multiple times with two parameters changing.The one parameter is two-dimensional, and the other one is one-dimensional.I have followed the TUTORIAL to creat a GamsModelInstance ,but something went wrong. It did optimize multiple times with original pa...

Hi, Clemens

Thank you for your answer, actually I want to use dictionary qta with GamsSetRecords instead of value. Maybe I did not understand the example, and did it wrong.May I know how to updata the multidimensional parameters ?

Thank you very much

Hi everyone, I want use modelinstance to multiple optimize with a two-dimensional parameter and a one-dimensional parameters in python. When I try to follow the example transport7.py to updata the two-dimensional parameter,it comes the error:TypeError: unhashable type: 'GamsSetRecord'. I have alread...

Hello everybody, I want to instantiate a MIP model with modifiers in the objective function. Follow the example transport7.py to GamsModifier a parameter im my model ,but encountered an error 796. The code and error list are uploaded. When directly called the code, it ran normally. I don't know wher...

Hi,I want to build a model of Optimizing valve control,one of equations is to promise that the continuous opening time is equal to emptying time at least。But I meet error 149,please help me how to correct it? Thanks sets i detention reservoir /Jinlong,Chiao,Shijing,Shangyang/ t time /0*23/ ; Paramet...