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Show HN: Radius – A Meetup.com Alternative

https://radius.to/
117•radius89•13h ago•46 comments

Show HN: A competition for small neural networks that play strategy games

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Show HN: Gdocs-me-up: a high-fidelity Google Docs exporter

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Show HN: jevals – replacing LLM judges with typed Jev decisions

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2380•arnemunthekaas•5d ago•262 comments

Show HN: Jevlang: Python with a Smart "If"

https://github.com/sumanmichael/jevlang
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Show HN: AgentTrace–Observability and runtime self-healing engine for AI agents

https://github.com/mohitkumar188/AgentTrace
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Show HN: Ifso.io – Personal finance simulator with no sign up required

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Show HN: Cactus Needle 3: 8-29MB automation models can match DeepSeek V4 Flash

https://cactuscompute.com/needle
231•HenryNdubuaku•3d ago•91 comments

Show HN: Judge Jev – Can you convince Jev of your innocence?

https://judge-jev.com/
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Show HN: Testing a non-generative decision model on 5,500 CLINC150 inputs

https://github.com/chr-kelly/jev-cookbook
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Show HN: I inadvertently built an English to Bash transpiler

https://github.com/gioblu/NPC-Forge/blob/main/npcs/termy/README.md
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https://mysetup.ai/
245•steveybrown•3d ago•138 comments

Show HN: Scrolling Text Generator – marquee, ticker and credits in the browser

https://scrollingtextgenerator.space
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60•Xyra•3d ago•25 comments

Show HN: Snapdrop: Instantly share files between devices. No setup, no signup

https://snapdrop.me
109•Capira•3d ago•49 comments

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https://github.com/ZIZKA-AI-SL/ZizkaDB
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Show HN: Swarm, an offline family tree app for macOS

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Show HN: jevc – compile policy prompts into deterministic verdict programs

https://github.com/doronp/jevc
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Show HN: AI Hack Watch - timeline and dataset of hacking incidents(JSON/RSS)

https://aihackwatch.com
3•Satinel•14h ago•0 comments

Show HN: A 3D Mac window switcher with browser tab support and search

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2•julien_dev•14h ago•0 comments
Open in hackernews

Show HN: Fahmatrix – A Lightweight, Pandas-Like DataFrame Library for Java

https://github.com/moustafa-nasr/fahmatrix
46•mousomashakel•1y ago
Hey HN, I’ve built Fahmatrix, a minimal, fast Java library for working with tabular data — inspired by Python’s pandas, but designed for performance and simplicity on the JVM.

After working extensively with Python’s data stack, I often ran into limitations related to speed, especially in larger or long-running data workflows. So I built Fahmatrix from scratch to offer similar APIs for manipulating CSVs, performing summary statistics, slicing rows/columns, and more — but all in Java.

Features:

Lightweight and dependency-free

CSV/TSV import with auto-headers

Series/DataFrame structures (like pandas)

describe(), mean(), stdDev(), percentile() and more

Fast parallel operations on numeric columns

Java 17+ support

Docs: https://moustafa-nasr.github.io/Fahmatrix/ GitHub: https://github.com/moustafa-nasr/fahmatrix

I’d love feedback from the Java and data communities — especially if you’ve ever wanted a simple dataframe utility in Java without needing full-scale ML libraries.

Happy to answer any questions!

Comments

rickette•1y ago
Congrats on putting this out there. There isn't a de facto pandas-like library in Java like you said. But for Kotlin there is: https://github.com/Kotlin/dataframe
mousomashakel•1y ago
Thanks so much! Yep, I’ve seen the Kotlin DataFrame lib — very elegant. Fahmatrix is meant for plain Java users who want similar capabilities without switching ecosystems. Appreciate the support!
uwemaurer•1y ago
Always great to see efforts to make working with data frames easier. Here are some similar data frame libraries for Java:

https://github.com/jtablesaw/tablesaw

https://github.com/dflib/dflib

My preferred way is just use duckdb java API. I didn't see anything better in performance/efficiency. Also a SQL query is often easier to write

theanonymousone•1y ago
Yes. It has bothered me for a long time too. Maybe the best mix is a dataframe library with basic operations (column select, non-null etc), which also allows SQL for more complex stuff?
radus•1y ago
Polars and duckdb interoperate nicely and can enable this flexibility
theanonymousone•1y ago
Does Polars have a Java library?
mousomashakel•1y ago
Totally agree that SQL can be the best tool for many jobs. My goal with Fahmatrix is to serve the opposite niche: where devs want something that's Java-native, procedural, and simple without reaching for an external engine. SQL support or DSL might come later though — I see the appeal.
skanga•1y ago
What about Tablesaw, Apache Arrow? How does this compare ...
mousomashakel•1y ago
Good question. I’ll publish benchmarks soon, but the core difference is that Fahmatrix is fully Java, no JNI, and minimalistic — ideal for small projects or environments like Android. Tablesaw and Arrow are more powerful, but heavier. Fahmatrix aims to be the “just enough” middle ground.
owlstuffing•1y ago
Nice!

I’m currently using manifold-sql with duckdb for this.

mousomashakel•1y ago
Thanks! That’s a great combo — manifold-sql + duckdb gives you strong typing with powerful SQL under the hood. Fahmatrix is aiming to complement that approach for cases where you want quick, native Java code without SQL — e.g., when building data flows or custom logic inline. Would love to hear if you’ve hit any pain points that a Java-native approach could help with.
theanonymousone
•
1y ago
Sure. So maybe notehr comment would be to make it (particularly the Series class), as compatible with Java Streams as possible.

Next step would likely be compatibility with popular libraries such as Apache Commons Math: https://commons.apache.org/proper/commons-math/userguide/sta...

mousomashakel•1y ago
Thanks! I'm aware of those great projects. Fahmatrix aims to offer a lightweight, dependency-free alternative that’s easy to embed in any Java app. DuckDB is super impressive, especially for SQL-heavy tasks — but my goal is more about a native, fluent API for those who prefer direct Java code over SQL.