This video is only 6 minutes and 40 seconds long and yet I learned more from you than I did from my university lecturer. Incredible! Credit to you Joshua! Many thanks.
This Video is uploaded 7 Years back but still, your teaching methodology is way better than that of my professor at the university. Thank you so much for your explanations.
The simplest explanation ever. It covers the fundamentals needed to understand the model, whereas my prof confuses with symbols and no definition/explanation.
Thankyou so much dear mentor Joshua your teaching strategy was surprising for me i got everything in this single lecture i was trying to find a lecture to clear my concepts about PL model you are the who helps me to finishing my topic .Thankyou so .Keep growing.
Congratulations Joshua for the content and the well-made framework !! Your video is a good example of how difficult explanations could be converted into easy ones...
Great explain sir. I was impressed with how clearly you explained it in less than 7 minutes. This is the hard part, now putting this into a solver is the simple part.
Thank you so much.This is so clear and clean.I am struggling hard to solve the transportation problem and this made me feel it's is so easy.thaks a lot for this work you did
Fantastic videos Joshua. Thank you. Question: what if demand and supply are always equal (e.g., a package delivery network where all packages must get to their destinations), how might we minimize the cost of collecting the packages from (n) distribution centers and delivering them to (n) cross dock facilities. For bonus points, we have 3 different vehicle sizes (S, M, L) with different operating costs. The DCs have different quantities of packages to deliver to each cross-dock. As a result S sized vehicle may get full before the end of it's run and it may have been more efficient to send a M or L sized vehicle, etc. I'd love your perspective (or anyone here) on how to solve this riddle. Thank you in advance and keep the great videos coming.
Thanks so much for the tutorials. Joshua, I have a couple of questions for you: 1. Do you also have videos for solving Integer Linear Programming problems and showing how it's related to NP-Complete problems? 2. Do you also have videos for solving Linear Programming problems using Simplex approach? Again, thank you for the tutorials.
My model on my solver proved infeasible for your second solution when demand exceed supply. I used greater than or equal sign for the demand constraints and less than and equal sign for the supply constraints, then I got an optimal solution.
HI,I have a question.Is this one of the types of transportation problem?I mix the methods of the Transportation problem.For example I don't know that what is the difference between Northwest method and This.
Thanks for the great video! How could I use this concept when the cost for each route(eg. 5,6,4,6,3,7 in your video) depends on the amount of item (xij)? I am wondering if the linear programming can be applied for the case where fundamental input data(cost in this case) is subject to change.
Unfortunately, no. The prices in an LP transportation problem must be fixed irrespective of volume. If the prices change with volume, it will no longer be a linear program.
@@joshemman Thanks for your kind reply. What model or method can I use for non-linear example? If there is one, It would be greatly appreciated if you can let me know the specific name of it with any kind of example.
@@강인수-t9n Non-linear programs (NLPs) are similar to linear programs in that they both contain algebraic functions and inequalities. The only difference is that linear programs contain only linear expressions such that if X and Y are decision variables, then XY or X^2 are invalid. In your case, if X = quantity and Y = Price, then total price XY is nonlinear. You can then solve it in Excel’s Solver by using the GRG Nonlinear method.
great video joshua...however one doubt,.... if transporting from toronto to DC3 is unviable shouldn't the constraint added be XT3 >= an abonormally high figure ( instead of zero), so that Excel Solver rejects this option..pls guide
For example, I'm aware that there are algorithms such as Bellman-Ford Algorithm (to find the shortest distance). Is there a specific name for the method that you have used?
I'm not aware of a specific name for this. However, I've seen it called the Transportation algorithm. The Simplex algorithm can also be used to solve it.
