Search found 14 matches
- 7 months ago
- Forum: Syntax
- Topic: Need help with multiple indices variable definition and indice/set domains within constraints (Vehicle Routing Problem)
- Replies: 1
- Views: 711
Re: Need help with multiple indices variable definition and indice/set domains within constraints (Vehicle Routing Probl
Hi gravityman123, There is a lot to unpack in your post (and this won't be a complete answer) but one thing that struck me is that your problem has a network in it, but you have not defined a set that describes the arcs in your network. For all sorts of problems it's a good programming practice to s...
an Error 140 is an "unknown symbol". It appears that you have not defined "Pe" or you might have a typo? Should it be "Pec" of "Ped"? BTW... when i run this, I get 25 errors... so you will need to fix more than just the last line. If you have a different number of errors, perhaps the wrong file got ...
you cannot use a loop statement within an equation definition... you need to somehow structure your equation definition so that the looping behavior you are hoping for is taken care of entirely with set operations. This might also necessitate an alias set. While doing this you might also need to ret...
there isn't a way to do this. I might suggest using python to read the excel file (the openpyxl package will work). then you can write a gdxfile with the gdxtools package
Example file: https://github.com/boxblox/gdxtools
Code: Select all
pip install gdxtools
It kinda sounds like you are using gams to do scripting? This seems a bit off topic for the forum, but I like being helpful... if you are just doing a bunch of data manipulation you might want to go into a python environment and work there... or if you have a massive dataset you could put it all int...
Hi Omidi, I am not as clear on why you would need an MPS file... but NEOS is a great tool... so this is worth figuring out. I typically engage with NEOS through the Kestrel 'solver' rather than their webforms. https://www.gams.com/latest/docs/S_KESTREL.html By using Kestrel the gams model is package...
Hi there ayledith, If you are familar with python you can use a tool I wrote to get data into a GDX and then you can load that data into a gams model through a $GDXIN statement... gdxtools can be installed with pip install gdxtools an example file of several different read/write operations can be fo...