This post aims to demonstrate how to make a solver usable from ExpressionsBasedModel. To do that we first implement a very simple solver, and then the integration. There are some…
This post describes how to do clustering with ojAlgo. Support for clustering is new with v55.1.0. This version added basic implementations of k-means and greedy clustering, but in a very…
The One Billion Row Challenge (1BRC) is a fun exploration of how far modern Java can be pushed for aggregating one billion rows from a text file. Grab all your…
The Fast Fourier Transform (FFT) algorithm to calculate discrete Fourier transforms (DFT) is a recent addition to ojAlgo. The last blog post was about Image Processing (using Singular Value Decomposition,…
Suppose a satellite takes a picture and wants to send it to earth. The picture may contain 1000 by 1000 "pixels" – little squares each with a definite color. We…
ojAlgo v53.1.0 was released today (2023-09-17). The most important additions are with the optimisation model and solvers: It's now possible to extract the Lagrange multipliers (dual variables) from the Optimisation.Result…
On this day, 20 years ago, ojAlgo was registered at SourceForge. At that time, that was the place for Open Source project hosting (and the default version control system was CVS).…
What software builds on ojAlgo, and what category developer finds ojAlgo useful? I've been meaning to write a post about that for some time now. Recently I've also felt an…
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…
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