Yet Another Math Programming Consultant

I am a full-time consultant and provide services related to the design, implementation and deployment of mathematical programming, optimization and data-science applications. I also teach courses and workshops. Usually I cannot blog about projects I am doing, but there are many technical notes I'd like to share. Not in the least so I have an easy way to search and find them again myself. You can reach me at erwin@amsterdamoptimization.com.

Sunday, April 20, 2014

How do they make a bug like this?

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For a small project I needed to solve a very small QP model. As the input and output were in Excel, it made some sense to try Excel’s Solver...
2 comments:
Sunday, April 13, 2014

Playing with job shop problem ft10 (5)

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In http://yetanothermathprogrammingconsultant.blogspot.com/2014/04/playing-with-ft10-job-shop-1.html we saw Gurobi was very successful in s...

Playing with job shop problem ft10 (4)

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We could not solve my job shop formulations in http://yetanothermathprogrammingconsultant.blogspot.com/2014/04/playing-with-job-shop-problem...

Playing with job shop problem ft10 (3)

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To see how the two different formulations mentioned in http://yetanothermathprogrammingconsultant.blogspot.com/2014/04/playing-with-job-shop...

Playing with job shop problem ft10 (2)

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How would a Constraint Programming formulation do on this problem: http://yetanothermathprogrammingconsultant.blogspot.com/2014/04/playing-w...
2 comments:

Playing with job shop problem ft10 (1)

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As discussed in http://yetanothermathprogrammingconsultant.blogspot.com/2009/09/job-shop-scheduling.html a MIP solver like Gurobi can solve...
1 comment:
Wednesday, April 9, 2014

Cleaning up the GAMS log

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When running a large model the standard GAMS log may dump a large amount of more or less uninformative text to the screen: After cleani...
Wednesday, March 19, 2014

Excel 64 bit: Windows API declarations

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The updated declarations for Excel 64 bit as reported in the file Win32API_PtrSafe.TXT (to be downloaded from  http://www.microsoft.com/en-u...
Thursday, March 13, 2014

Excel 64 bit treeview

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I have developed some data entry tools in Excel. It has some VBA code and uses a TreeView component to select things like crops, countries, ...
Tuesday, February 18, 2014

Terrible gaps in MIP model

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I am doing something really wrong here:     Nodes    |    Current Node    |     Objective Bounds      |     Work Expl Unexpl ...
1 comment:
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Erwin Kalvelagen
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