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What is an eigenvalue?
An eigenvalue of a square matrix $LATEX A$ is a scalar $latex \lambda$ such that $latex Ax = \lambda x$ for some nonzero vector $latex x$. The vector $latex x$ is an eigenvector of $LATEX A$ and it…
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The latest blog posts to take off on Hacker News. 21,823 posts.
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Maps and Memory Leaks in Go
A map can always grow in memory; it never shrinks. Hence, if it leads to some memory issues, you can try different options.
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C isn't a programming language anymore
Phantomderp and I have both recently been very aligned on a particular subject: being extremely angry about C ABIs and trying to fix them . Where we’re not aligned is why we’re mad about them.
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Why would anyone need JavaScript generator functions?
You can go a long time as a JavaScript developer without ever feeling the need for generators. Hence, it’s natural to wonder: What are they good for? Why would you ever need one? What’s the point? But generators can do some neat tricks. And they may even change the way you approach certain problems.
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How to make sure no dynamic memory is used
How to disable heap (dynamic memory allocation) in an embedded application? This article goes into the details of linker files and how to detect dynamic memory allocation.
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The essence of Reed-Solomon coding
Let’s say we want to store some data on multiple drives, so that we can recover from drive failures.
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Nearly all binary searches and mergesorts are broken (2006)
Posted by Joshua Bloch, Software EngineerI remember vividly Jon Bentley's first Algorithms lecture at CMU, where he asked all of us incoming Ph.D. ...
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Zero point leet seconds (2018)
While calculating certain round-trip times, here is a number I came across that is surprisingly memorable: It takes light 0.1337 seconds to travel the length of the Earth's equator via vacuum or air. Let me repeat that. It takes light "zero point leet" seconds to travel once around the equator.
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Creating a pick and place control board with the RP2040
A look into the hardware design of Starfish
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The type system is a programmer's best friend
Programming, Coffee and Indie Hacking
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Multiple assertions are fine in a unit test
One test case, not one test assertion.
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Solving Common Problems with Kubernetes
A storytelling guide to starting k8s
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Markdown, Asciidoc, or reStructuredText – a tale of docs-as-code
Who writes the developer documentation for your product? During the early days of my tech career, I worked on a database replication product at IBM. My immediate team had developers and testers but not a single technical writer. I can speak for myself when I say that I never bothered to know who keeps writing the…
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Postgres Insider Terminology
If you've ever wondered - What is a tuple? What is a Postgres page? What's the difference between a record and a row? What is a relation? What's an array? What is TOAST? This post is for you! These are terms you hear all the time in the Postgres world. This post breaks down what these terms mean and how they are used.
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The Linux scheduler: A decade of wasted cores (2016)
The Linux Scheduler: a Decade of Wasted Cores – Lozi et al. 2016 This is the first in a series of papers from EuroSys 2016. There are three strands here: first of all, there’s some grea…
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Clojure from a Schemer's perspective (2021)
Hi, I'm Peter Bex, a Scheme and free software enthusiast from the Netherlands. See my user page on the CHICKEN wiki or my git server for some of my projects.
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Next C compiler is a D compiler: Introducing DMD's ImportC
In my never ending quest to have oksh support every C compiler in existence, I sometimes find C compilers in places you wouldn't expect them. Today, I'd like to demonstrate the C compiler built into the Digital Mars D compiler, or DMD for short. Recent versions of DMD have a complete C11 compiler built in named…
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Verifying GCC optimizations using an SMT solver
This post describes the implementation of pysmtgcc. See “GCC Translation Validation” for background information.
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Android Studio’s “Code contains easter egg” inspection (2019)
There’s an inspection called “Code contains easter egg” that comes with Android Studio. This one:
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Nushell: Introduction to a new kind of shell
This article covers a gentle introduction to the shell nushell
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Visualizing Diffs: The Myers difference algorithm (2020)
In 1986, Eugene Myers published An O(ND) Difference Algorithm and Its Variations , which unified the problems of finding the longest common subsequence of two sequences (the LCS of "driftwood" and "artwork" is "two") and finding the shortest edit script for transforming one sequence into another. Myers showed that…
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Zig 0.10.0 Release Notes
Zig is a general-purpose programming language and toolchain for maintaining robust , optimal , and reusable software.
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Lil: A Scripting Language
Lil is part of the technology that powers Decker , a multimedia creative tool inspired by HyperCard . Decker uses Lil for adding custom behavior to decks and the widgets within. Lil is designed to be learned in layers, but it is a richly multi-paradigm language which incorporates ideas from imperative, functional…
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Linker, can you spare a meg? (2021)
Tailscale on iOS runs as a special kind of app, a Network Extension. This lets us run in the background, so we can secure traffic from all of your applications, without them having to change anything. But with this power comes a memory straightjacket. Normal iOS apps can use 5GB or so of memory before iOS kills them…