https://lemire.me/blog/2022/11/22/what-is-the-size-of-a-byte-array-in-java/ Came across this blog post by Daniel Lemire. It's not his most interesting or informative post, but made me remember a little utility I wrote many years ago. MemoryEstimator…

The main benefit with ojAlgo's suite of mathematical optimisation solvers is that it's open source pure Java. It allows to solve mathematical optimisation problems directly in the JVM – no…

ojAlgo v52.0.0 has been released! It is the first release to require Java 11. org.ojalgo.array The array package now support "arrays" of any primitive numeric type. In particular support for…

Just discovered a new Java LP solver, and did a quick update to the Pure Java LP Solver Benchmark. Apache Commons Math (ACM) contains an LP solver. Version 3.6.1 of…

If you need to solve mathematical optimisation LP, QP or MIP models without calling native code – running only pure Java code – there are very few options. In fact,…

What is a Generalized AutoRegressive Conditional Heteroscedasticity (GARCH) process? That's a long fancy name for something that's actually relatively simple. The overall context is time series analysis. Let's sort out…

There are a number of different file formats around for persisting optimisation models, ojAlgo even has its own model file format. One of the file formats stands out as "the"…

A comparison between some iterative methods to solve linear equation systems. We'll compare 3 different methods: Jacobi, Gauss-Seidel and the Conjugate Gradient method. First the Jacobi and Gauss-Seidel methods are…

Imagine there's a sequence of operations you need to perform on a dataset, and this dataset is very large. There is absolutely no way the entire dataset could fit in…

With ojAlgo v51.2.0 the IntegerSolver gained support for Gomory Mixed Integer (GMI) cuts. Details of what they are and how they're derived is described in many publications. Just google it.…

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