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:
Monday, February 17, 2014

Coloring maps

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I am trying to make it easy to make high-quality maps for presenting model results. See: http://yetanothermathprogrammingconsultant.blogspot...
Friday, February 14, 2014

Excel modeling

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When translating an Excel spreadsheet model using Solver into a GAMS model, I came across a construct like: This can be modeled as a line...
Monday, February 10, 2014

Parallel R for making many maps

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When making many maps ( http://yetanothermathprogrammingconsultant.blogspot.com/2014/01/maps-from-gams.html ) it may make sense to try to ex...
2 comments:
Tuesday, February 4, 2014

GAMS–>R: gdxrrw vs gdx2sqlite

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There are at least two ways to get data from GAMS into R. Use the tool gdxrrw ( http://www.gams.com/presentations/informs2012_gdxrrw.pdf ) ...
2 comments:
Wednesday, January 22, 2014

Maps from GAMS

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Creating maps from GAMS via R. The maps are at country and fpu (basin) level. R can export to different bitmap and vector formats.
Sunday, January 12, 2014

Watson Related Revenue: 100 million vs 10 billion

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http://www.businessweek.com/articles/2014-01-10/ibms-artificial-intelligence-problem-or-why-watson-cant-get-a-job Watson realized $100 mil...
1 comment:
Thursday, December 5, 2013

Populating a spreadsheet through VBA

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Populating a large spreadsheet table can be slow if we push data cell-by-cell. Here is a small example. Naïve approach We start with cre...
2 comments:
Friday, November 15, 2013

Converting USDA PSD data to GAMS GDX

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USDA has some good agricultural production and trade data available at http://www.fas.usda.gov/psdonline/psdHome.aspx . Here we try to read ...
1 comment:
Monday, October 28, 2013

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Turbo Pascal Compiler in JavaScript:  http://www.teamten.com/lawrence/projects/turbo_pascal_compiler/ . There must be more of these int...