Francesco Mazzoli

Popular posts: 9
Total points: 2,276
HN comments: 1,007
Rank: #698 personal

Visit mazzo.li → RSS feedOn Hacker News May 2021 – Oct 2025

Systems & Performance 6 Software Engineering 4 Math & Algorithms 3 Society, Policy & Culture 1 Security & Privacy 1 Networking & Internet 1

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Speeding up atan2f

2021245 points103 comments Systems & Performance details

`atan2f` is an important but slow trigonometric function. In this article we'll explain how to approximate it, and implement a version 50x faster than `glibc` on batches of inputs.

The essence of Reed-Solomon coding

2022168 points41 comments Math & Algorithms details

Let’s say we want to store some data on multiple drives, so that we can recover from drive failures.

Lánczos Interpolation Explained (2022)

2025166 points17 comments Math & Algorithms details

When you resize, rotate, or in any way transform an image; or more generally when you resample some discrete signal, the software you are using must _interpolate_ between the discrete points to produce a result. Linear and cubic interpolation are easy to explain, but Lánczos interpolation, one of the most popular…