# Arash Baharvandi

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## Activity overview

Latest activity by Arash Baharvandi
• Arash Baharvandi created a post,

### Runtime

Hi, I have two equal problems that second one include more constraints i.e. three times than first one. First problem would be run in 5 seconds, while second one takes 900 seconds that it does not ...

• Arash Baharvandi commented,

Thanks a lot for your help.

• Arash Baharvandi commented,

Thank you, I figured out the issue. I simplified code and removed all fixed variables. from gurobipy import *import numpy as np#indicesmyList = list(range(0,4))vctr=np.array(myList)I=vctr# generato...

• Arash Baharvandi commented,

Hi,   I have following code , but I do not know when I increase ''peak'' model is infeasible, while it should be feasible. For peak=10, I got optimal solution, but for more than 10, it will be infe...

• Arash Baharvandi created a post,

### Different platforms and different results

Hi, I wrote a problem to be solved by Gurobi (Python), before increasing a parameter, I got correct results by Gurobi and another platform, when I increase a parameter I will get infeasible problem...

• Arash Baharvandi commented,

Sorry for not clarifying it well.   I have a parameter (vf) which is a matrix, this matrix contains two columns and I want to use each column for any problem. vf= np.array([[1,2],[2,4],[4,4]]) In f...

• Arash Baharvandi commented,

Thanks for your response,   I mean I have the following problem and I want to solve this problem 3 times, I have a matrix vf (with 3 columns), and I want to solve this problem for each column of th...

• Arash Baharvandi created a post,

### Adding objective functions and variables to a matrix

Hi,   I have an optimization problem. A parameter will get new values and solve the problem again. How can I define a matrix included objective functions and variables? (python with Gurobi package)...

• Arash Baharvandi commented,

Thank you for your response,   I have another question. I really appreciate you for responding my question. I have a constraint, and there is relationship between its indices, for example if i=1, t...

• Arash Baharvandi created a post,