Sabrin Rashwan

Dear Jaromil, That is great. I have got your idea Jaromil and will use M = 3000.  With my best wishes, Sabreen

@Xianbang and @ Jaromił , thanks a lot for your prompt response.  Jaromił, thanks to your reply I paid attention to a specific point in my model in general. As Jaromił  has mentioned and by try and...

Dear Jaromil, I have some good news. My basic model is working perfectly now and so is the Arc-elimination-based model. with arc elimination I realized higher speed reaching a gap of 8% within 600 ...

Dear Jaromil, Now I got all the bounds:   max  min t[I,j] 824 0 B 1745 50 Bk 2000 0 d 30 15 D 529 0   I isolated M for each constraint, in order  as follows:           M ...

Dear Jaromil, hereafter are the perfect constraints that include the Big-M. I succeeded to calculate the bounds of the variables but failed to get the values of the D variable. If you can help me g...

Many many thanks Jaromil, you always support me. I am preparing the required data. Will come soon. Regards, Sabreen

Dear Jaromil, Thanks a lot for your support. I will find how to understand that .lp file to analyze it correctly. For now, I think I have to return a step back to the basic model. I discovered an i...

Thank you Jaromil for your prompt response. I used the if - statement incorrectly.  Now, I have applied your recommendations. and the model returns to work again. However, I faced another relevant ...

I have applied some Arc Elimination rules in the hope to get the model solved faster, but unfortunately, it gets slower. I compared the basic model and the model with arc elimination for a gap of 4...

Thanks a lot, Jaromił, I need i!=j because I iterate over i which are not in Cr but it will be in N\Cr and j is in N. As you may be noticed from my newer posts I am working more on getting ride of ...