ahmad alanaqreh
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Activity overview
Latest activity by ahmad alanaqreh-
ahmad alanaqreh commented,
Thank you so much Maliheh, now it is working in a proper way
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ahmad alanaqreh created a post,
Find the variable values for different solutions by PoolSolutions
AnsweredI have a MIP and I am solving the model and collecting all the possible solutions by using PoolSolutions parameter, now I am trying to get the value of x variable for each solution but unfortunatel...
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ahmad alanaqreh created a post,
The bounds of the variables
AnsweredI have a model where I define three variables as follows : alpha[a] = model.addVar(lb=-GRB.INFINITY, name="alpha%d" % a)beta[i, j] = model.addVar(lb=-GRB.INFINITY, ub=0, name="beta%d,%d," % (i, j))...
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ahmad alanaqreh commented,
Sorry Jaromil, your suggestion is not clear for me, terminating the MP model will terminate the callback which is not what I want, do you mean terminating the DSP model where I am trying to change ...
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ahmad alanaqreh commented,
In my case x[i, j] and z are parameters(alpha, beta, omega, and lamda are variables), actually, these are the values changing every time, so I am changing my objective function based on the new val...
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ahmad alanaqreh commented,
Hi Jaromil Thanks a lot for your answer, yes that is true, in this case how I can replace the objective function?? should I create a new model with a new objective function or there is a way to do ...
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ahmad alanaqreh commented,
Hi Jarmoil I have the following objective function: model.setObjective(quicksum(x[i, j] * alpha[i] for (i, j) in E if i != s) + quicksum((n * (1 - x[i, j]) - 1) * beta[i, j] for (...
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ahmad alanaqreh created a post,
change the coefficient of the variables in the objective function
AnsweredI have a model that I am solving with callback, I need to change the coefficients of the variables in the objective function from time to time, I have seen the Model.chgCoeff() to change the coeffi...
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ahmad alanaqreh commented,
Hi Jaromil, this is just the smallest example I have, the time here is acceptable but when the graph has hundreds or thousands of nodes and edges it really takes a lot of time, there is any part th...
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ahmad alanaqreh created a post,
Improve performance of constraint-adding in Gurobi Python
OngoingIn the model I am working on I have to add constraints, the constraints based on the edges of a graph, I have the decision variable x = {}for (i, j) in E: x[i, j] = model.addVar(vtype=GRB.BINAR...