Modeling with GAMS - Sample Problem 1

In this Tutorial I walked through modeling with GAMS a Step by Step for a sample problem.

Hope you enjoy it.

[olayemijohnson]

Hi Ammar, Thanks for the video. This is my first contact with GAMS . I am a student from Nigeria trying to get video on modelling and estimating stochastic DEA problem using GAMS but haven't had contact with any on youtube. Do you have any Idea on stochatic DEA? I really need help. Thank you

[hrvbryn]

Hi Sir, I am a student of Cavite State University here in the Philippines. We are now formulating a production planning model for lettuce farming system with the objective of minimizing the cost of the raw materials. It is harder than other max problems.

[worldden]

Thank you, my friend. You saved my ass. I made my hometask, appeared hope to graduate my university and I will not commit suicide =)

[linajuliethsuarezmedina]

Hi. I changed my Gams version and now my results are different. I am working in a MILP algorithm and I am using the Baron and Cplex solvers. I don't understand what is the problem. The version I installed is 29.5 version. Help me please! Thanks!

[begumdeniz]

Your result does not satisfy the problem :( put them in the equations! you will see...

[alpier]

thanks bro i just learned how to model my friend !!! you're very helpful, i hope your family will be healthy forever !!!! and happy new year from a fellow german brother !!!

[Eng.HumamGhazal]

I wrote the same exact code and I got this error:
*** WARNING: Presolve found the problem infeasible or unbounded
--- Cplex diagnoses the model to be either infeasible or unbounded.
--- There is no such GAMS Model Status so returning with a status of infeasible.
--- Model has been proven to be either infeasible or unbounded
And all the results are zero. Any help?

[KevansDied]

Thank you, sir. You have helped me so much!

[arvintavanaei]

The result does not satisfy the second constraint. 4x1+2x2 has to be equal to 40. Obviously, x1=0.1 and x2= -0.2 does not satisfy this equation.

[deepakmishra]

Sir 7-8 constraints ka koi problem mil jayega

[shamunnay]

Thanks for the useful video. However, simplex should be written as LP = Splex;

[WickedChild]

Great video, taking CS 524 at UW-Madison and your video helped, thank you so much!

[dennissilva]

Thank you, man!
It was really useful!

[احمدعبدالصاحب-لغ]

احسنت لكن ممكن ان تشرح على موضوع GAMS CODE CO-OPTIMIZATION باستخدام MATHMATICAL FORMULATION

[maryamhajibabaie]

Hello
I have a problem in flexible job shop code in gams
Can anyone help me?

[arwaabougharib]

Tried to replicate the same model but got different results. May be this has to do with the error "Model has an unbounded ray".. See 13:43

[Tauhid]

Hi, could you please upload how to write a disjunctive problem, for example, Max\{f(X)| X satisfies eq1 or eq2 or eq3\}.

[kald]

KFUPM is the best university in the world.

[فائزهحصیبی-فض]

Thans alot your solution is so easy upload more about gams ❤

[md.asadujjaman]

Do you have any lecture on resource constrained project scheduling problems?