# Ariel W

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## Activity overview

Latest activity by Ariel W
• Ariel W commented,

Thanks Bot, for your detailed explanation, I got the principle behind this!

• Ariel W commented,

Thanks! But still a little bit question: Does Gurobi continue the downward branching iterative calculation on the basis of this input solution or anything else?

• Ariel W created a post,

### May I ask whether part of the results of the heuristic algorithm search designed by myself can be input into Gurobi

May I ask whether part of the results of the heuristic algorithm search designed by myself can be input into Gurobi, so that Gurobi can continue to iterate on this basis? The heuristic algorithm he...

• Ariel W commented,

• Ariel W commented,

Thanks Soares! I got what the meaning of this, but when i use the "model.relax()" in my program, it seems to ignore almost all constraints as my constraints are seemly all related to binary variabl...

• Ariel W created a post,

### How to use the function "model.relax()"?

Using relax function of Gurobi can we derive the bound of original model? can it help me simplify the MIP model solving? how can i do this, please give me an example. Thank you!

• Ariel W commented,

Dear Sir, Thanks for your reply. I still have some questions below, which hope for your gentle advises. Q1: In my model, trips need to be all assigened. How this situation will be solved? Q2: And h...

• Ariel W created a post,

### How to set the priority of certain types of decision variables in Gurobi

Awaiting user input

In my model, s[v,i,j] and w[d,i,j] represent whether vehicle v operates trip j after trip i, and driver d operate trip j after trip i, respectively, they are all binary variables. I want to  give p...

• Ariel W commented,

Sorry, Riley. Waste your time. When I just revisited my code, I found typo. It can work with two similar index. Thank you!

• Ariel W commented,

Difinitely! The values of V,S,F are the same as above. V = range(1,3) F = range(1,3) S = range(1,4) The full error message is as follow, the definition of sth referred to your answer about 'product...