Java object analogue to R data.frame [closed]

Tablesaw (https://github.com/jtablesaw/tablesaw) is Java dataframe begun in 2015 and is under active development (2018). It's designed to be as scalable as possible without sacrificing ease-of-use. Features include filtering by rows and columns, descriptive stats, map/reduce functions, cross-tabs, plots, machine learning. Apache license.

In one query test it returned 500+ records from a 1/2 billion record table in 2 ms.

Contributions, feature requests, and feedback are welcome.

I have just open-sourced a first draft version of Paleo, a Java 8 library which offers data frames based on typed columns (including support for primitive values). Columns can be created programmatically (through a simple builder API), or imported from text file.

Please refer to the README for further details.

The project is still wet from birth – I am very interested in feedback / PRs, tia!

I also found myself in need of a data frame structure while working in Java recently. Fortunately, after writing a very basic implementation I was able to get approval to release it as open source. You can find my implementation here: Joinery -- Data frames for Java. Contributions and feature requests are welcome.