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Anders Peterson @Optimatika

ojAlgo

Joined December 2021
  • Tweets 81
  • Following 49
  • Followers 20
8 Photos and videos
Ever wonder how to hook up your mathematical optimisation solver to ojAlgo? Here's a blog post outlining what to do: ojalgo.org/2025/02/hooking-y…

Hooking Your Solver to ojAlgo

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 very high-level...

ojalgo.org
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ojAlgo v55.1.0 is out! Changes with this minor release: 1. New clustering support 2. Major refactoring of all (file) reader/writer utilities github.com/optimatika/ojAlgo…

ojAlgo/CHANGELOG.md at develop · optimatika/ojAlgo

oj! Algorithms. Contribute to optimatika/ojAlgo development by creating an account on GitHub.

github.com
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ojAlgo v55 github.com/optimatika/ojAlgo… ojAlgo is a pure Java, no dependencies, maths and optimisation library (that's like AI). Among other things it contains LP, QP and MIP optimisation solvers.

ojAlgo/CHANGELOG.md at develop · optimatika/ojAlgo

oj! Algorithms. Contribute to optimatika/ojAlgo development by creating an account on GitHub.

github.com
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Thank you @Dominick1993 for sponsoring me on @github. You can join them at my sponsors profile: github.com/sponsors/optimati…

Sponsor @optimatika on GitHub Sponsors

Develops and support oj! Algorithms (ojAlgo)

github.com
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I found my #FirstPullRequest: github.com/lessthanoptimal/J…. What was yours? firstpr.me

Update for ojAlgo v39 by apete · Pull Request #2 · lessthanoptimal/Java-Matrix-Benchmark

I just made sure it compiles.

github.com
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New ojAlgo LP solver github.com/optimatika/ojAlgo…

ANN New LP solver · optimatika ojAlgo · Discussion #568

The new LP solver is now the default alternative (develop branch, version 55.0.0-SNAPSHOT). Previously you had to set model.options.experimental = true; to use it. Now, if you continue to set that ...

github.com
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ojAlgo v54.0.0 is released! github.com/optimatika/ojAlgo…

ANN v54.0.0 · optimatika ojAlgo · Discussion #562

Just released ojAlgo v54.0.0. This is primarily a cleanup and refactoring release. Many things that were previously marked as deprecated are now actually removed. There are also direct api breaking...

github.com
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@optimatika spends 4300% more time coding than tweeting (if you wonder why I don't tweet that much) shiptalkers.dev/compare?gith…
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How to complete the 1BRC using some ojAlgo utilities. ojalgo.org/2024/02/1brc-usin…

1BRC using ojAlgo

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 (virtual) threads, reach out to SIMD,...

ojalgo.org
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Just released ojAlgo v53.2.0. ojAlgo now (finally) includes an FFT implementation, and an effort has been made to assert it really is fast – as fast as can be in pure Java. Also blogged about how to use 2D DFT for image processing with ojAlgo. ojalgo.org/2023/12/image-pro…

Image Processing using FFT

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 Decompo...

ojalgo.org
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Anders Peterson retweeted
Mathieu
@miniapeur
23 Dec 2023
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Image Processing with Singular Value Decomposition using ojAlgo ojalgo.org/2023/10/image-pro…
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That's an animated png file, but you only see the first frame here at Twitter. ojalgo.org/2023/10/image-pro…

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 can code the colors, in a range...

ojalgo.org
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ojAlgo v53.1.0 ojalgo.org/2023/09/ojalgo-v5… via @Optimatika

ojAlgo v53.1.0

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...

ojalgo.org
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Anders Peterson retweeted
Jfokus
@Jfokus
25 May 2023
How to write fast Java code – thinking about memory by Anders Peterson at #Jfokus 2023 youtube.com/watch?v=SovDuQef…
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Anders Peterson retweeted
Casey Muratori@cmuratori
26 Apr 2023
I'm tired of seeing lazy "software performance doesn't matter" excuses on forums and social media, so I devoted an entire video to the mountains of evidence debunking that ridiculous idea: computerenhance.com/p/perfor…

Performance Excuses Debunked

There are many legitimate arguments to be had about performance, but there are also plain old excuses. It's time to end the excuses.

computerenhance.com
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ojAlgo v53.0.0 was released today. It is also the 20th anniversary since the project was registered at SourceForge. ojalgo.org/2023/04/ojalgo-20…

ojAlgo 20 Years Today

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). The anniversary is...

ojalgo.org
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Who Uses ojAlgo? I asked ChatGPT that question, and was surprised by the answer. ojalgo.org/2023/04/who-uses-…

Who Uses ojAlgo?

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 urgency to check out...

ojalgo.org
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Anders Peterson retweeted
Аlina Yurenko 🇺🇦
@alina_yurenko
20 Feb 2023
In 2014 one hundred Ukrainians died in the center of Kyiv standing up for our democracy and freedom. That's why it's very hard for me to listen to "the ordinary people can't control the actions of their government". ucc.ca/2023/02/17/the-heroes…

The Heroes of the Heavenly Hundred - The Ukrainian Canadian Congress (UCC) official website

Image - National Memorial to the Heavenly Hundred Heroes and Revolution of Dignity Museum

ucc.ca
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Anders Peterson retweeted
Mario Fusco@mariofusco
9 Feb 2023
I forgot to mention that the slides of my #jfokus talk on Project #Loom are available here speakerdeck.com/mariofusco/g…

Game of Loom: implementation patterns and performance implications playing with virtual threads

Virtual threads will be very likely the next big game changer in the Java ecosystem, allowing to have the scalability of asynchronous programming models…

speakerdeck.com
Riccardo Cardin
@riccardo_cardin
9 Feb 2023
Replying to @mariofusco
Did you share the presentation somewhere?
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