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Non-convex Quadratic Integer Programming
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Formulating optimization models inside traditional programming languages such as Python is very popular. The main tool the developers use to make this possible is operator overloading. There are cases, where we can write code that looks somewhat reasonable, is accepted and processed without any warning or error messages, but is total nonsense. In...
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GAMS 48 tests
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Prevent Loops in GAMS
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This book [1] on DEA models has an accompanying website with all the GAMS models [2]. Of course, I'll be doing some nitpicking on the GAMS code. In some of the GAMS code, unneeded loops are used. From [3]: The inner loop is not needed. We can write this as:Many beginning GAMS modelers use too many explicit loops. Most likely because they are used...