More digits in log file

Answered

Noortje Bonenkamp

May 07, 2020 14:10

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Dear all, 

I am creating plots of the evolution of the upper and lower bound of  the objective function for a MILP, where I use gurobi to generate these. 

When I create a logfile, either .log, .txt or .csv, it seems that values are rounded to 4 decimals in the file, and that I cannot retrieve the original values (only from the Python console directly). Is there a way to print these in a logfile with more decimals? My model is programmed in Pyomo. 

Best regards,

Noortje

 

 

    Nodes    |    Current Node    |     Objective Bounds      |     Work

 Expl Unexpl |  Obj  Depth IntInf | Incumbent    BestBd   Gap | It/Node Time


0 0 2.5500e+08 0 194 3.2154e+08 2.5500e+08 20.7% - 1s

0 0 2.5502e+08 0 193 3.2154e+08 2.5502e+08 20.7% - 1s

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• Official comment

  

  Simranjit Kaur

  • Gurobi Staff

  December 06, 2024 00:46

  This post is more than three years old. Some information may not be up to date. For current information, please check the Gurobi Documentation or Knowledge Base. If you need more help, please create a new post in the community forum. Or why not try our AI Gurobot?.
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  Eli Towle

  • Gurobi Staff

  May 07, 2020 16:06

  Hi Noortje,

  There unfortunately isn't a way to increase the log precision like this. However, you can retrieve these lower and upper bounds programmatically with the \(\texttt{MIPNODE_OBJBST}\) and \(\texttt{MIPNODE_OBJBND}\) callbacks (see here). This should make plotting much easier, since you won't have to spend time extracting these values from the log. Pyomo is a third-party API, but I believe they support callbacks like this.

  Thanks,

  Eli

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  Noortje Bonenkamp

  May 07, 2020 18:05

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  Thank you, Eli! I will try it like this! 

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