The model exceeds the community license limits for linear models of more than 5000 rows or columns

GAMS
1

I am using the transport optimization model. It shows that my data has 3,186 rows and 128,905 columns, exceeding the 5000-column limit.

I have a file with distance data from 41 facilities to 3144 counties. Facilities are in the column, and counties are in the row. Gams is counting it as 128,905 column.

I am an academic user. What should I do? Do I need to purchase a license for an unrestricted size limit?

Please help!

2

You can either go for a paid license or convert your model to GAMSPy model. You can get a free license that allows unlimited model sizes for the latter one.

-Michael

3

Thank you Micheal for the suggestions.

4

I forgot another option: You can use the NEOS server to solve your large models. Studio is well equipped to submit models to and retrieve results from NEOS. Check out the Studio documentation.

-Michael

5

Thanks. I have considered all the options. Given the time constraint, I am considering buying the license. For other options I need to code again.

I found out CPLEX, COPT are for linear optimization.

I am considering COPT.

Will it do the work?

6

You can get an evaluation license from sales@gams.com and you can see what solver works best for you or offers the biggest bang for the buck.

-Michael