explainer · HACKER NEWS RECOMMENDATION
Fast Inverse Square Root — A Quake III Algorithm
Nemean · 3 HN recommenders · 3 recommendation months
Recommended by 3 Hacker News commenters across 3 months (2021–2022).
SignalTube analysis
Among 11 other explainer videos tagged Algorithms & data structures, the mean is 4.2 distinct HN recommenders. This video has 3 distinct HN recommenders, below that mean. Recommendations span 3 distinct months; the peer average is 3.5 months. This is a data-derived comparison, not a human review or quality rating.
75% of its 4 labeled comments are marked as recommendations or strong recommendations. HN mention years are 2021–2022; those years describe discussion history, not upload date. Its verified runtime is 20 minutes 8 seconds. YouTube lists its publication date as 2020-11-28.
- Channel / speaker
- Nemean
- Verified runtime
- 20m 8s
- YouTube upload date
- 2020-11-28
- Hacker News mention years
- 2021–2022
SAME TOPIC AND FORMAT
Compare with related videos
The comparison cohort uses other explainer videos in Algorithms & data structures. “Shared recommenders” counts HN users who recommended both videos in the source graph.
| Video | HN recommenders | Recommendation months | Positive label share | Shared recommenders | Runtime | Upload date |
|---|---|---|---|---|---|---|
| Fast Inverse Square Root — A Quake III AlgorithmCurrent video | 3 | 3 | 75% | — | 20m 8s | 2020-11-28 |
| The Fastest Way to Board a Plane Feels Like the Slowestexplainer · CGP Grey | 9 | 6 | 69% | No recorded overlap | 8m 28s | 2019-02-04 |
| 30 Weird Chess Algorithms: Elo Worldexplainer · suckerpinch | 8 | 6 | 62% | No recorded overlap | 42m 36s | 2019-07-15 |
| The Fast Fourier Transform (FFT): Most Ingenious Algorithm Ever?explainer · Reducible | 7 | 8 | 89% | No recorded overlap | 28m 23s | 2020-11-14 |
THREE SOURCE-BASED CONTEXT POINTS
Why Hacker News recommends it
Each note combines the dataset’s stance label and short rationale; comment bodies are not reproduced. Open the HN source for the original discussion.
The archive classifies this as a contextual reference in “Ask HN: What's a small example of some of the best code ever written?”. Its short rationale: Famous algorithm cited as great code.
The archive classifies this as a recommendation in “Bit Patterns of Float”. Its short rationale: Approachable explanation of why fast inverse square root works.
The archive classifies this as a recommendation in “One does not simply calculate the absolute value”. Its short rationale: Explains float bits as logarithm, making Q_rsqrt make sense.