Modeling with GAMS - Sample Problem 1

Ammar Harasani

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6 окт 2024

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Комментарии : 91

@hrvbryn6669 5 лет назад

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.

@alpier1429 5 лет назад

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 !!!

@WickedChild95 8 лет назад

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

@rafaqathus1233 5 лет назад

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

@world4den 5 лет назад

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

@KevansDied 17 дней назад

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

@ishmamulhoque97 3 года назад

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

@Industrial_Engineer Год назад

*Come to my channel*

@فائزهحصیبی-ف1ض 4 месяца назад

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

@batula.m.1571 2 года назад

Hi. Thank you for saving my life.

@berruz00 2 года назад

Great example!! Thanks fronte Italy

@yagacademy80 4 года назад

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

@ebaifrancis1428 4 года назад

Thanks a million, Ammar. I really enjoyed it.

@dennissilva7531 3 года назад

Thank you, man! It was really useful!

@DrSingaravelanA 5 лет назад

Great Tutorial for beginners.

@olayemijohnson6304 Год назад

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

@ysser75fazeli59 2 года назад

excellent. thanks for this tutorial

@mohammedalboraich629 3 года назад

شكرا جزيلا عمار... محمد من العراق

@shamunnay 5 лет назад

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

@rajaramprajapati9157 8 лет назад

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

@niakurniasari9616 3 года назад

Thanks Ammar....

@arvintavanaei6614 5 лет назад

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 5 лет назад

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 5 лет назад

@@giovannihernandez3208 same here

@Jotapalomo 5 лет назад

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

@AmirElShennawi 4 года назад

@@giovannihernandez3208 same results

@AJK544 3 года назад

@@giovannihernandez3208 Same bro~

@aidafarihin 7 лет назад

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

@linnartfelklm.sc.6467 3 года назад

great video

@arwaabougharib8698 5 лет назад

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 3 года назад

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

@satyamshree3080 2 года назад

I got 1790 for Z

@syrianmusic1403 6 лет назад

Excellent! Many thanks.

@linajuliethsuarezmedina4006 6 лет назад

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!

@thussain4609 Год назад

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

@Industrial_Engineer Год назад

GAMS is Great,

@begumdeniz3800 8 лет назад

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

@aliengineer5458 7 лет назад

tesekkurlar begum hanim i am stady in ankara what about u

@rafaqathus1233 5 лет назад

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

@rebeccaheckmann6453 3 года назад

Thanks for this advices!

@milhampasha1426 7 лет назад

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

@md.asadujjaman7667 4 года назад

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

@muzafferuyar4601 8 лет назад

Great Tutorial, Thanks Ammar :)

@amrualqurashi1030 8 лет назад

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

@احمدعبدالصاحب-ل5غ 8 лет назад

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

@1001ramin 7 лет назад

thank you very much ammar

@naseral-mansouri9515 7 лет назад

Thank you Ammar

@manoshidehingia3674 4 года назад

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

@deepakmishra4176 3 года назад

Sir 7-8 constraints ka koi problem mil jayega

@rohiniharidas 3 года назад

Thanks

@Eng.HumamGhazal 7 месяцев назад

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?

@efemenaekagha3406 3 года назад

Thank you alot brother.

@rafaqathus1233 5 лет назад

VERY GOOD

@ahmedabbas9856 2 года назад

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

@Tauhid214 4 года назад

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

@cudihistory1905 6 лет назад

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

@dami4862 5 лет назад

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

@weihnachten362 5 лет назад

@@dami4862 same problem here :(

@giovannihernandez3208 5 лет назад

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