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Piecewise linear functions and formulations for interpolation (part 2)
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Piecewise linear functions and formulations for interpolation (part 3)
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Visualization of a large scheduling solution
One of the problems we face when developing larger scheduling problems is: how do we look at the solution? The solution data is too large to eye ball, and looking at tables with 0-1 decision variables...
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Math Checker?
Spell checkers are very useful. It may not be such a bad idea to have something like a "Math checker". It could flag things like:ReferencesBashiri, M. & Karimi, H. J, Effective heuristics and...
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Generating Pareto optimal points (part 1)
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Generating Pareto optimal points (part 2)
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Sometimes a simple heuristic is the best
Demoing a cutting stock problem, I was a bit overthinking things. If the material is cheap, the optimal cutting patterns are too complicated. Simplified cutting patterns are better even when this...
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Anaconda Python Install
The installation of anaconda 64 bit on my windows laptop worked fine. But then all conda and pip commands came back with the fatal error:Can't connect to HTTPS URL because the SSL module is not...
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Cutting Application
Version 1 of cutting application.The algorithms are a small part of the whole application. Some of the issues:Users are not always able to "specify" in detail what they want in advance. Building...
View ArticleOrdering of variables / constraints in an LP/MIP
In [1] a user asks about how to force a certain ordering of variables for an LP/MIP model. This is an intriguing question for me because I really never worry about this.The user asks only about...
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Bad naming?
Example C++ codeThe above fragment is from [1]. I never write loops like this. I use \(n\) for limits or counts, but never for a loop index.Looking at this, I realized I have many of these "rules"....
View ArticleBad question?
In [1] a user asks:I need to build a MILP (Mixed integer linear programming) constraint form this if-else statement: with beta is a constant.if (a > b) then c = beta else c = 0How can I build the...
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Machine Scheduling
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Assignment: Scipy vs Cplex
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Special assignment problem
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Maximum Dispersion
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Binary multiplication
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View ArticleQuadratic Indicator Constraint?
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Advanced R (second edition)
The second edition is out. My version has color pictures (so it must be good!). This book is about the R programming language (not about statistical techniques). Even if you know R really well, you...
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Finding the central point in a point cloud
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