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Show HN: WebTiles – create a tiny 250x250 website with neighbors around you

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102•dimden•5d ago•13 comments

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56•cosinusalpha•9h ago•17 comments

Show HN: Digital Carrot – Block social media with programmable rules and goals

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Show HN: HyTags – HTML as a Programming Language

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54•lassejansen•1d ago•24 comments

Show HN: A fast CLI and MCP server for managing Lambda cloud GPU instances

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17•odedfalik•4h ago•2 comments

Show HN: Xoscript

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Show HN: Harmony – AI notetaker for Discord

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Show HN: Tiny FOSS Compass and Navigation App (<2MB)

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117•nativeforks•13h ago•36 comments

Show HN: Nori CLI, a better interface for Claude Code (no flicker)

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26•csressel•9h ago•5 comments

Show HN: Claude Code Scheduler

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199•jellyotsiro•22h ago•90 comments

Show HN: Grsh – A high-performance shell for FreeBSD written in Rust

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41•antomal•7h ago•23 comments

Show HN: The Tsonic Programming Language

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55•jeswin•1d ago•9 comments

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Show HN: A kids' math app without dark patterns

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Show HN: Experimentplatform, A/B testing images with LLMs

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Show HN: Nogic – VS Code extension that visualizes your codebase as a graph

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126•davelradindra•1d ago•49 comments

Show HN: I built a local RAG pipeline to index 28 years of my personal data [video]

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Show HN: Cachekit – High performance caching policies library in Rust

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Show HN: Skillshare – Sync skills across AI CLI tools

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8•runkids•9h ago•0 comments

Show HN: An iOS budget app I've been maintaining since 2011

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154•Priotecs•1d ago•59 comments

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66•lalitgehani•1d ago•13 comments

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45•schappim•1d ago•8 comments

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Show HN: Seapie – a Python debugger where breakpoints drop into a REPL

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18•markushirsimaki•2d ago•9 comments

Show HN: Self-host Reddit – 2.38B posts, works offline, yours forever

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266•19-84•1d ago•60 comments

Show HN: Lazypg – A simple terminal UI for PostgreSQL

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2•bluehuman•7h 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•8mo 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•8mo 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•8mo 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•8mo 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•8mo 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•8mo ago
Polars and duckdb interoperate nicely and can enable this flexibility
theanonymousone•8mo ago
Does Polars have a Java library?
mousomashakel•8mo 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.
theanonymousone•8mo 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•8mo 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.
skanga•8mo ago
What about Tablesaw, Apache Arrow? How does this compare ...
mousomashakel•8mo 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•8mo ago
Nice!

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

mousomashakel•8mo 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.