Gurobi Optimization

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TR, … Dr Michael F3

4/4/19

Using OR in a Gurobi Expression

I suggest two constraints: a1+b1+c1<= an integer a1+b1+d1<= an integer On Saturday, March 30,

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Using OR in a Gurobi Expression

I suggest two constraints: a1+b1+c1<= an integer a1+b1+d1<= an integer On Saturday, March 30,

4/4/19

4/2/19

Retirement of Gurobi Google group

Nearly 10 years ago, we launched the Google discussion group as a community of Gurobi users. Thanks

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Retirement of Gurobi Google group

Nearly 10 years ago, we launched the Google discussion group as a community of Gurobi users. Thanks

4/2/19

angry....@gmail.com

4/2/19

How can access to the information on the gap?

I am solving a mixed-integer linear programming (MILP) problem on matlab using the solver gurobi.

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How can access to the information on the gap?

I am solving a mixed-integer linear programming (MILP) problem on matlab using the solver gurobi.

4/2/19

4/2/19

extreme ray equals to zero

Hi~ I am trying to solve my problem by benders decomposition. However, when I tried to add a

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extreme ray equals to zero

Hi~ I am trying to solve my problem by benders decomposition. However, when I tried to add a

4/2/19

evelyn...@ucn.cl, … Michael Winkler6

4/1/19

Error with callback expample in python: Unable to read model

How do you execute the script? Best, Michael

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Error with callback expample in python: Unable to read model

How do you execute the script? Best, Michael

4/1/19

4/1/19

accessing terminal node information when solving mixed 0-1 SOCP

Hi Gurobi users, Suppose I try to solve a mixed 0-1 SOCP using Gurobi. I terminate the branch-and-

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accessing terminal node information when solving mixed 0-1 SOCP

Hi Gurobi users, Suppose I try to solve a mixed 0-1 SOCP using Gurobi. I terminate the branch-and-

4/1/19

jack chou, Robert Luce3

4/1/19

Dear Robert Thank you ! I have solved my problem under your guidance. Best regards Jack 在 2019年3月30日

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Dear Robert Thank you ! I have solved my problem under your guidance. Best regards Jack 在 2019年3月30日

4/1/19

Stefanos Delikaraoglou, Robert Luce2

3/30/19

Jacobian Matrix at optimal solution of an LP

No, there is no interface to query the Jacobian of the augmented barrier funcion. But the only

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Jacobian Matrix at optimal solution of an LP

No, there is no interface to query the Jacobian of the augmented barrier funcion. But the only

3/30/19

jack chou, Silke Horn3

3/30/19

NotImplementedError

Dear horn, Thank you! I have solved my problem under your guidance. Best regards 在 2019年3月30日星期六 UTC+

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NotImplementedError

Dear horn, Thank you! I have solved my problem under your guidance. Best regards 在 2019年3月30日星期六 UTC+

3/30/19

Leandro C. Coelho, Michael Winkler3

3/29/19

MIP Start and invalid pointer

Hi Michael, Many thanks for reminding me of valgrind. Problem solved (of course it was on my end, as

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MIP Start and invalid pointer

Hi Michael, Many thanks for reminding me of valgrind. Problem solved (of course it was on my end, as

3/29/19

Chris, … Michael Winkler9

3/29/19

Re: Same model different results

Oh wow, I expected the status code to be CUTTOFF, but it totally makes sense to not continue to

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Re: Same model different results

Oh wow, I expected the status code to be CUTTOFF, but it totally makes sense to not continue to

3/29/19

Maad Al-Owaifeer

3/29/19

Greetings, Is there a way to terminate the Gurobi LP solver and report the current basic solution? I

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Greetings, Is there a way to terminate the Gurobi LP solver and report the current basic solution? I

3/29/19

Rich LaSota, Michael Winkler2

3/28/19

Gap in callbacks

Hi Rich, could you provide the instance (in MPS format and additional settings you use)? Best if you

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Gap in callbacks

Hi Rich, could you provide the instance (in MPS format and additional settings you use)? Best if you

3/28/19

Shashank Srivastava, Tobias Achterberg3

3/28/19

Why do I need internet connection and gurobi license to just create a .mps/.lp file

Yes I use only gurobi instant cloud. The license is a cloud license. On Wednesday, March 27, 2019 at

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Why do I need internet connection and gurobi license to just create a .mps/.lp file

Yes I use only gurobi instant cloud. The license is a cloud license. On Wednesday, March 27, 2019 at

3/28/19

Ignacio Basallote, Robert Luce4

3/27/19

Numerical Problems

Hello Ignacio, the model you have posted seems to be different from the one causing the extreme

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Numerical Problems

Hello Ignacio, the model you have posted seems to be different from the one causing the extreme

3/27/19

Sagarika Khandelwal, Silke Horn4

3/27/19

Reuse model for multiple iterations and updating constants

Hi Sagarika, I am not sure I understand what you are saying. What do you mean with “it again loads

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Reuse model for multiple iterations and updating constants

Hi Sagarika, I am not sure I understand what you are saying. What do you mean with “it again loads

3/27/19

G Abouelseoud, Robert Luce4

3/26/19

Gurobi reporting initial solution as infeasible by mistake

Dear Robert, I really can't thank you enough. Your remark made me notice that there is an error

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Gurobi reporting initial solution as infeasible by mistake

Dear Robert, I really can't thank you enough. Your remark made me notice that there is an error

3/26/19

s.sch...@gmail.com, Robert Luce3

3/26/19

TypeError: object of type 'gurobipy.LinExpr' has no len()

Thank you very much! Am Di., 26. März 2019 um 14:51 Uhr schrieb 'Robert Luce' via Gurobi

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TypeError: object of type 'gurobipy.LinExpr' has no len()

Thank you very much! Am Di., 26. März 2019 um 14:51 Uhr schrieb 'Robert Luce' via Gurobi

3/26/19

kianoush....@gmail.com, Silke Horn2

3/26/19

Lazy callback ignored bey the solver

Hi Kianoush, The method is called “cbLazy” (with an upper case L). - Silke > On 26. Mar 2019, at

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Lazy callback ignored bey the solver

Hi Kianoush, The method is called “cbLazy” (with an upper case L). - Silke > On 26. Mar 2019, at

3/26/19

Csaba Raduly-Baka, Silke Horn2

3/26/19

MPS result output

Hi Csaba, Gurobi can write the solution to a file. Use ResultFile with a filename that has a .sol

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MPS result output

Hi Csaba, Gurobi can write the solution to a file. Use ResultFile with a filename that has a .sol

3/26/19

alex st, Silke Horn7

3/25/19

Lazy constraint callback error

Hi, Yes i see it now, thank you very much! Do you know why it only checks four solutions in the

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Lazy constraint callback error

Hi, Yes i see it now, thank you very much! Do you know why it only checks four solutions in the

3/25/19

kamal mustafa, Silke Horn2

3/25/19

How to run the optimization with 50 lowest efficiency providers

Hi, Could you post a code example to reproduce this? - Silke > On 19. Mar 2019, at 08:30, kamal

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How to run the optimization with 50 lowest efficiency providers

Hi, Could you post a code example to reproduce this? - Silke > On 19. Mar 2019, at 08:30, kamal

3/25/19

Abbadi Net, Robert Luce2

3/25/19

a solution of this message error of protege

Hi, the error could hint at an issue with the setup of your Gurobi installation. Which Gurobi version

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a solution of this message error of protege

Hi, the error could hint at an issue with the setup of your Gurobi installation. Which Gurobi version

3/25/19

Bryce Stansfield, Ed Rothberg2

3/24/19

GRB.OPTIMAL =2 when model is infeasible?

GRB.OPTIMAL is a constant; it is always equal to 2. You should be looking the Status attribute.

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GRB.OPTIMAL =2 when model is infeasible?

GRB.OPTIMAL is a constant; it is always equal to 2. You should be looking the Status attribute.

3/24/19

Jason, … Mohamed Ibrahim7

3/24/19

multiprocessing compatibility issue with Gurobi

You need to change your design and here is two issues with your code: 1 - The main method has to be

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multiprocessing compatibility issue with Gurobi

You need to change your design and here is two issues with your code: 1 - The main method has to be

3/24/19

3/24/19

Virtual machine

Hello all, I want to start some computational study. I have MIP in Gurobi on the MATLAB interface. Do

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Virtual machine

Hello all, I want to start some computational study. I have MIP in Gurobi on the MATLAB interface. Do

3/24/19

Akhilesh Soni, Michel Jaczynski4

3/22/19

Gurobi with Docker Image

Thanks, Michel. Yes : was redundant but I got the same error even after removing : I am not sure what

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Gurobi with Docker Image

Thanks, Michel. Yes : was redundant but I got the same error even after removing : I am not sure what

3/22/19

jj6...@gmail.com

3/22/19

Call Optimizer Asynchronously

Hello, Can we call the optimizer asynchronously? As I understand, the model.optimize() is a blocking

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Call Optimizer Asynchronously

Hello, Can we call the optimizer asynchronously? As I understand, the model.optimize() is a blocking

3/22/19

Martha Sen, Silke Horn2

3/22/19

Learning basic modelling and Gurobi (Python) as fast as possible without any knowledge? Suggestions for basic tutorials for solving TSP?

Hi, Have you seen the TSP example on the Gurobi website? http://examples.gurobi.com/traveling-

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Learning basic modelling and Gurobi (Python) as fast as possible without any knowledge? Suggestions for basic tutorials for solving TSP?

Hi, Have you seen the TSP example on the Gurobi website? http://examples.gurobi.com/traveling-

3/22/19

s. sadeghi, … Silke Horn6

3/22/19

How to model an special constraint in MILP

Hi, You will need some auxiliary variables. How about this: x1 + x2 + x3 - 3 h1 - t - h3 = 0 - t + h3

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How to model an special constraint in MILP

Hi, You will need some auxiliary variables. How about this: x1 + x2 + x3 - 3 h1 - t - h3 = 0 - t + h3

3/22/19

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