chaung yun chi

Hi,I have two question now 1.I had a problem implementing real world data in my model, seems like my model refuse to build second launch station but I didn't set a constraint for it. This is my cod...

I've solved a hierarchical facility location problem, but something is wrong. this is a one of my answer. I want the blue dots can be assigned to the green(Launch) as well. If the distance is short...

Hi I want to generate a few constraints to represent that    "if a facility is built in location j then you can assign demand i there otherwise, you can't assign demand i there" which can also simp...

while I was trying to create an objective function \(\sum x_i 30000 + \sum y_j 100000 + \sum \sum d_{ki} 100 d_i + \sum \sum d_{kj} 100 d_j + \sum \sum d_{ij} 100 d_j + S 15000\) it showed the erro...

hi  what I want to do is create three different types of point with random coordinate so this is what I did  [deleted for better readability]

station,cost=multidict({"x1":12000,"x2":22000,"x3":30000,"x4":9000,"x5":11000,"x6":40000,"x7":90000,"x8":55000,"x9":66000,"x10":45800,"x11":65000})demand,weight=multidict({"y1":2.2,"y2":2,"y3":4,"y...