Java对象类似于R data.frame [英] Java object analogue to R data.frame

问题描述

我非常喜欢R中的data.frames，因为你可以在一个数据结构中存储不同类型的数据，并且你有很多不同的方法来修改数据（添加列，组合data.frames，...），它从数据中提取子集非常容易，...

I really like data.frames in R because you can store different types of data in one data structure and you have a lot of different methods to modify the data (add column, combine data.frames,...), it is really easy to extract a subset from the data,...

是否有可用的Java库具有相同的功能？我最感兴趣的是以类似矩阵的方式存储不同类型的数据，并能够提取数据的子集。

Is there any Java library available which have the same functionality? I'm mostly interested in storing different types of data in a matrix-like fashion and be able to extract a subset of the data.

在Java中使用二维数组可以提供类似的结构，但是添加一个列并随后提取前k个记录要困难得多。

Using a two-dimensional array in Java can provide a similar structure, but it is much more difficult to add a column and afterwards extract the top k records.

推荐答案

我刚刚开源了 Paleo ，一个Java 8库，它提供基于类型列的数据框（包括对原始值的支持）。可以通过编程方式（通过简单的构建器API）创建列，也可以从文本文件导入列。

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.

请参阅自述文件了解更多详情。

该项目从出生开始仍然潮湿 - 我对反馈/ PR非常感兴趣，tia！

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

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