feather: R bindings to the feather API

CRAN: http://cran.r-project.org/web/packages/feather/index.html
GitHub: https://github.com/wesm/feather

> library(feather)

バージョン: 0.3.0

関数名	概略
`feather`	Access a feather store like a data frame
`feather_metadata`	Retrieve metadata about a feather file
`read_feather`	Read and write feather files.

feather

feather形式ファイルの読み込み

> feather("gapminder.feather")

Error in normalizePath(path, mustWork = TRUE): path[1]="gapminder.feather": No such file or directory

feather_metadata

featherファイルのメタ情報を取得する

> feather_metadata("gapminder.feather")

Error: IO error: Failed to open file: gapminder.feather

read_feather / write_feather

feather形式ファイルの読み込みと書き込み

> data("gapminder", package = "gapminder")
> dim(gapminder)
> 
> write_feather(gapminder, "gapminder.feather")
> rm(gapminder)
> 
> read_feather("gapminder.feather")
> 
> microbenchmark::microbenchmark(
+   func.data = data("gapminder", package = "gapminder"),
+   func.feather = read_feather("gapminder.feather")
+ )