Modeling with GAMS - Sample Problem 1

[@world4den]

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

[@alpier1429]

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 !!!

[@hrvbryn6669]

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.

[@WickedChild95]

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

[@rafaqathus1233]

CAN U PLZ SEND ME GMAIL ,NED TO ASK ABOUT GAMS

[@فائزهحصیبی-ف1ض]

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

[@KevansDied]

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

[@yagacademy80]

Amazing Ammar HARASANI for the dedicated work....I learn a lots....

[@batula.m.1571]

Hi.
Thank you for saving my life.

[@ebaifrancis1428]

Thanks a million, Ammar. I really enjoyed it.

[@berruz00]

Great example!! Thanks fronte Italy

[@ishmamulhoque97]

Thank you. It will be helpful if you do another video on solving Mixed Integer Problems using GAMS

[@dennissilva7531]

Thank you, man!
It was really useful!

[@DrSingaravelanA]

Great Tutorial for beginners.

[@ysser75fazeli59]

excellent. thanks for this tutorial

[@muzafferuyar4601]

Great Tutorial, Thanks Ammar :)

[@aidafarihin]

Brilliant! Thank you for helping me solve a simple question for my assignment :)

[@mohammedalboraich629]

شكرا جزيلا عمار... محمد من العراق

[@niakurniasari9616]

Thanks Ammar....

[@linnartfelklm.sc.6467]

great video

[@rafaqathus1233]

VERY GOOD

[@olayemijohnson6304]

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

[@linajuliethsuarezmedina4006]

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!

[@rebeccaheckmann6453]

Thanks for this advices!

[@arwaabougharib8698]

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

[@faustomelendezm]

What did you get? I got 1790 for z...

[@satyamshree3080]

I got 1790 for Z

[@HameedLeghari]

great sir

[@efemenaekagha3406]

Thank you alot brother.

[@syrianmusic1403]

Excellent! Many thanks.

[@thussain4609]

why you stopped uploading these videos ..its really helpful bro

[@rajaramprajapati9157]

hello sir, i ve gone through the tutorial video u have posted on youtube about gams.. i want to learn more .. i ll be glad if u provide me some more tutorials

[@manoshidehingia3674]

Hello sir! I would like to know if the Objective Function is a constraint?

[@fconteEBdotcom]

Thank you for the video!

[@md.asadujjaman7667]

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

[@amrualqurashi1030]

Can you do an stochastic programming problem where scenario reduction through SCENRED is used?

[@shamunnay]

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

[@milhampasha1426]

Great tutorial but the results different to mine, still very helpful

[@1001ramin]

thank you very much ammar

[@naseral-mansouri9515]

Thank you Ammar

[@cudihistory1905]

The solution in my computer didn't was the same that yours. Why?

[@dami4862]

His iteration remains one, and I don't know how that came into existence...x1=3.909...

[@weihnachten362]

@@dami4862 same problem here :(

[@giovannihernandez3208]

I replicated the exercise, here is the code:
Positive variable x1;
Free variable x2, z;
Negative variable x3;
Equations
Con1,
Con2,
Con3,
Obj;
Con1.. x1 + x2 + x3 =L= 7;
Con2.. 4*x1 + 2*x2 =E= 40;
Con3.. 10*x1 + x3 =G= 30;
Obj.. 30*x1 + 100*x2 - 50*x3 =E= z;
Model InterTest /all/;
Options LP = Cplex;
Solve InterTest using LP maximizing z;
Display x1.L, x2.L, x3.L, z.L ;
My results are different:
VARIABLE x1.L = 3.909
VARIABLE x2.L = 12.182
VARIABLE x3.L = -9.091
VARIABLE z.L = 1790.000

[@deepakmishra4176]

Sir 7-8 constraints ka koi problem mil jayega

[@hosseinheydaryan7308]

thnx for Ammar
from Tehran university

[@estherasare1123]

how do i solve the problem of unboundness in my model?

[@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?

[@msadelinetzl1407]

Hi, not sure if you still need help, I try to check with gpt, it says that change the x2 to positive variable, then there are answers for x1,x2,x3,z but definitely different answers from the answers shown in this video. ( For reference: x1 =10, x2 =0, x3= -70, z=3800)

[@ahmedabbas9856]

I need more example please to understand the variable , con , obj etc

[@begumdeniz3800]

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

[@aliengineer5458]

tesekkurlar begum hanim i am stady in ankara what about u

[@rafaqathus1233]

CAN U PLZ SEND ME GMAIL ,NED TO ASK ABOUT GAMS

[@estherasare1123]

how can i set bounds in my model?

[@arvintavanaei6614]

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.

[@giovannihernandez3208]

I replicated the excercise, here is the code:
Positive variable x1;
Free variable x2, z;
Negative variable x3;
Equations
Con1,
Con2,
Con3,
Obj;
Con1.. x1 + x2 + x3 =L= 7;
Con2.. 4*x1 + 2*x2 =E= 40;
Con3.. 10*x1 + x3 =G= 30;
Obj.. 30*x1 + 100*x2 - 50*x3 =E= z;
Model InterTest /all/;
Options LP = Cplex;
Solve InterTest using LP maximizing z;
Display x1.L, x2.L, x3.L, z.L ;
My results are different:
VARIABLE x1.L = 3.909
VARIABLE x2.L = 12.182
VARIABLE x3.L = -9.091
VARIABLE z.L = 1790.000

[@sunshinehero1422]

@@giovannihernandez3208 same here

[@Jotapalomo]

Same happened to me, any explanation for this? I even use the same spaces between letters and numbers

[@AmirElShennawi]

@@giovannihernandez3208 same results

[@AJK544]

@@giovannihernandez3208 Same bro~

[@haftuhiluf1266]

thanks

[@lazuardialdi9818]

have you license of GAME?

[@samanmohsenirad2942]

Thanks, bro.

[@rafaqathus1233]

CAN U PLZ SEND ME GMAIL ,NED TO ASK ABOUT GAMS

[@muhammadibrahimshah9627]

I press f9 in keyboard but the results do not show

[@Dr.Ali_Jawad]

اكمل الدروس الشرح جميل

[@Tauhid214]

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

[@maryamhajibabaie8015]

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

[@raghadjassimghayadh4000]

عاشت ايدك

[@احمدعبدالصاحب-ل5غ]

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

[@gmgs16556]

thx

[@WaqarAhmad-mt8nq]

Bro i need help

[@amritojha4020]

sir upload more videos

[@Hamdan-qg2wt]

اشكرك على الشرح الدرس هل هناك شرح بالعربية

[@alpier1429]

بولي بصمت غبية ، والحشوات هي الأم

[@alashhab]

th-cam.com/video/ZGxxe5D3jkM/w-d-xo.html

[@b.fricke1894]

Hallo das ist Kool

[@faisalalshehri2082]

تشرح خصوصي البرنامج

[@oumaimasahtout9114]

please help me who knows how to work on gams

[@rafaqathus1233]

CAN U PLZ SEND ME GMAIL ,NED TO ASK ABOUT GAMS

[@alpier1429]

@@rafaqathus1233 i can tell you anything about gams. give me your gmail and ill do it for free (and your password)

[@kald241]

KFUPM is the best university in the world.

[@mariamhotak1296]

school driven

[@Utkirdjan]

very bad description. Super not good:) first is give sets.

[@mohs369]

ممكن رقم الواتس اتواصل معاك؟

[@rohiniharidas]

Thanks