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Show HN: iPhone app takes simultaneous images from 2 lenses, fuses into 1 photo

https://photosynthesis.camera
33•sajomes•2d ago•19 comments

Show HN: Git-knife – edit commit messages, authors, and dates like a spreadsheet

https://github.com/TheRealYT/git-knife
69•YonathanTesfaye•2h ago•49 comments

Show HN: Write.md, a free, open-source, themeable Markdown editor for macOS

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24•danielbilekq•4h ago•28 comments

Show HN: Needle2: 14MB agentic LLM for phones, wearables, smart home and robots

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482•HenryNdubuaku•1d ago•162 comments

Show HN: Scroll through all 43252003274489856000 Rubik's Cube states

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271•Alen123•18h ago•99 comments

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156•ubermon•1d ago•84 comments

Show HN: Mcptoon – Token-efficient MCP CLI client

https://github.com/activeing123/mcptoon
64•mcptokensaver•12h ago•41 comments

Show HN: Proxima serves 4x more requests with no hardware change on vLLM

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3•pythongiant•2h ago•1 comments

Show HN: Tokyo Trains

https://greggman.github.io/tokyo-trains/
4•greggman65•3h ago•0 comments

Show HN: The self-improving QA agent for software teams

https://vostride.com
3•pranshuchittora•3h ago•0 comments

Show HN: Parley – your coding agent can talk to a teammate's agent

https://parley.weldra.dev
6•tyagivivek•4h ago•2 comments

Show HN: drawtonomy – Draw and run driving scenarios in the browser

https://github.com/kosuke55/drawtonomy
3•kosuke55•4h ago•0 comments

Show HN: Voice driven murder mystery, Interview AI suspects with your voice

https://www.whodunnitai.com/
206•MrRowTheBoat•1d ago•85 comments

Show HN: A tiny LLM running at 21,000 tok/s on a $250 FPGA (Live Demo)

https://www.mikeayles.com/blog/on-chip-llm-kv260/
70•mikeayles•1d ago•23 comments

Show HN: Tesserae, self-hosted dashboards for e-ink panels

https://tesserae.ink/
4•xDaftTurtle•6h ago•2 comments

Show HN: AI Pulse a fake LED strip beside the macOS Dock that shows agent status

https://github.com/leog/ai-pulse
18•leog_me•19h ago•5 comments

Show HN: Compare Wikipedia articles between languages in the Middle East

https://wikicompare.app
5•idonov•7h ago•4 comments

Show HN: A Project Oberon System version running on RISC-V instead of RISC-5

https://github.com/rochus-keller/OberonSystem/tree/op2-rv32
120•Rochus•2d ago•19 comments

Show HN: Higher-dimensional lattices unfolded into the 2D plane

https://number-garden.com/?@THLP@
18•unitX•4d ago•1 comments

Show HN: Langkast – One workspace for every AI model, agents, and your files

https://langkast.com
2•edwn_mnl•11h ago•1 comments

Show HN: I vibecoded a heavy lift drone

https://lukeiseman.substack.com/p/i-vibecoded-a-drone
19•liseman•13h ago•3 comments

Show HN: My local climbing gym from photogrammetry

https://kmcheung12.github.io/climb-preview/tour/ae43c6e5
27•a_c•20h ago•11 comments

Show HN: ConfigLedger -Find configuration drift across code, CI, Docker and docs

https://github.com/DevFoundry-labs/configledger/
3•DevFoundry-labs•12h ago•0 comments

Show HN: NiceShot AI – The analytics layer competitive games forgot to add

https://github.com/karimm-ai/NiceShot_AI
3•niceshot-ai•12h ago•0 comments

Show HN: 100% native Swift harness (NOT Electron)

https://github.com/Lore-Hex/QuillCode
14•ljlolel•1d ago•5 comments

Show HN: Design Engineering, as a Service

https://designshippers.com/?0
15•krm01•1d ago•12 comments

Show HN: Airy – Free, fast, and simple voice content creation

https://airy.so
46•login588•2d ago•18 comments

Show HN: I made alchemical-cosmological PCB badges

https://github.com/KaiPereira/Alchemical-Cosmological-Badges
22•kaipereira•6d ago•3 comments

Show HN: Seedle, daily -dle for Minecraft seeds

https://seedle.loch.tools/
3•lwansbrough•14h ago•0 comments

Show HN: Graph2agent; Mermaid diagrams, explained for agents

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6•alexandroskyr•20h ago•1 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.