Thank you so much for including all the Row Operations in the tableaus. Nearly every other video thinks the row operations are "obvious" or "trivial" so doesn't bother including them. As a beginner it makes it a nightmare to follow along. It's conceptually easier to consider this as a Linear Algebra problem than an approximation problem.
You're very welcome, and thank you for the kind comment. I have videos on the variant methods (Big M, and Two-Stage) which may also prove helpful for you.
I've been struggling to understand this algorithm for days now. All the material provided by my uni was very vague and all the popular videos on UA-cam about this matter confused me even more. Your video popped up in my recommendations just now and i have my exam tomorrow. It helped me greatly to understand it thoroughly and i feel confident going into my exam tomorrow. Thanks!
Hi, excellent video ! - just wondering if you've made the video of when the inequality sign is greater than or equal to rather than less than or equal?
Hello. I am glad it was useful to you. Yes, I have videos on both the two-stage method and the Big M method. ua-cam.com/video/SLwAUYvSfZI/v-deo.html ua-cam.com/video/grGWsUHdWQM/v-deo.html
Hi. Thanks alot . I now understand way better I have been taught in class 4 over a month now. I just don't get the substitution 4 row 8 using the formula R8=R4+5R7. Why 5 and how did use the formula to get the answers for R8. Pls simplify. That is where I blocked . I am doing an assignment currently using your teaching.
@@daviesDynamo7554 The whole principle is that once you have found your pivot, you are going to perform combinations of the different rows so that the pivot becomes a 1 (always by multiplying or dividing that row by a constant), and all other elements in the column become zero (always by taking the existing row and then adding or subtracting multiples of the pivot row). Since the value in tableau 1, p row, z column is -5, we need to add 5 x our new pivot row to make zero in that cell (R8 = R4 + 5 x R7 becomes R8 = - 5 + 5 x 1 = 0). Does that help? And yes, for the element going into tableau 2, p row, x column, you should have - 3 + 5 x 1/2 = -1/2. That is the element that goes in that place.
Good question. The reason is that you ALWAYS need to do a combination of rows that involves taking the original row (R2) and then either adding or subtracting a multiple of your transformed pivot row (R7).
You're an absolute legend for this.
Thank you so much for including all the Row Operations in the tableaus. Nearly every other video thinks the row operations are "obvious" or "trivial" so doesn't bother including them. As a beginner it makes it a nightmare to follow along. It's conceptually easier to consider this as a Linear Algebra problem than an approximation problem.
This is the best video I found about the subject, thank you for your cristal clear explanation.
You're very welcome, and thank you for the kind comment. I have videos on the variant methods (Big M, and Two-Stage) which may also prove helpful for you.
I just want to say thank you for this, It explained the Simplex Algorithm so well. I understand it way better now than reading off the textbook.
You're welcome. I'm glad it was useful to you.
I've been struggling to understand this algorithm for days now. All the material provided by my uni was very vague and all the popular videos on UA-cam about this matter confused me even more. Your video popped up in my recommendations just now and i have my exam tomorrow. It helped me greatly to understand it thoroughly and i feel confident going into my exam tomorrow. Thanks!
I'm very pleased that you found it useful. I hope that the exam goes / went well!
Thanks for this. I have my Decision test in a few hours and I desperately need to recap this. It’s my last exam!
Thanks, your explanation and tips are well executed
u got one subscriber again
Hi, excellent video ! - just wondering if you've made the video of when the inequality sign is greater than or equal to rather than less than or equal?
Hello. I am glad it was useful to you. Yes, I have videos on both the two-stage method and the Big M method. ua-cam.com/video/SLwAUYvSfZI/v-deo.html ua-cam.com/video/grGWsUHdWQM/v-deo.html
Hi. Thanks alot . I now understand way better I have been taught in class 4 over a month now. I just don't get the substitution 4 row 8 using the formula R8=R4+5R7. Why 5 and how did use the formula to get the answers for R8. Pls simplify. That is where I blocked . I am doing an assignment currently using your teaching.
When I solved for R8=-3+5×1/2 gave me -2/1.
@@daviesDynamo7554 The whole principle is that once you have found your pivot, you are going to perform combinations of the different rows so that the pivot becomes a 1 (always by multiplying or dividing that row by a constant), and all other elements in the column become zero (always by taking the existing row and then adding or subtracting multiples of the pivot row). Since the value in tableau 1, p row, z column is -5, we need to add 5 x our new pivot row to make zero in that cell (R8 = R4 + 5 x R7 becomes R8 = - 5 + 5 x 1 = 0). Does that help?
And yes, for the element going into tableau 2, p row, x column, you should have - 3 + 5 x 1/2 = -1/2. That is the element that goes in that place.
@@Dinoga got it now. Thanks very much
Simplex? More like “we get”…the algorithm now, thanks to your wonderful explanation!
Legend
Thanks.
Hi there, I have a question regarding 6:47. Why can't you do R6=R2-1 instead of taking R7 away from R2?
Good question. The reason is that you ALWAYS need to do a combination of rows that involves taking the original row (R2) and then either adding or subtracting a multiple of your transformed pivot row (R7).
what if there are two columns that both have the most negative value in the objective row? Would you just randomly pick one?
You pick the one that's the most negative. If they're the same, you can make a random selection.
shoutout to f1 gamer
I got different answers..
Nahom disliked your video :(
I came looking for copper, I got gold
Thank you, that is a very kind comment. I am glad that you found it useful.
mr gooch approves this joke
nn