rio: A Swiss-Army Knife for Data I/O

Overview

The aim of rio is to make data file I/O in R as easy as possible by implementing four simple functions in Swiss-army knife style:

import() provides a painless data import experience by automatically choosing the appropriate import/read function based on file extension (or a specified format argument)
import_list() imports a list of data frames from a multi-object file (Excel workbook, .Rdata files, zip directory, or HTML file)
export() provides the same painless file recognition for data export/write functionality
convert() wraps import() and export() to allow the user to easily convert between file formats (thus providing a FOSS replacement for programs like Stat/Transfer or Sledgehammer). Relatedly, Luca Braglia has created a Shiny app called rioweb that provides access to the file conversion features of rio. GREA is an RStudio add-in that provides an interactive interface for reading in data using rio.

Installation

The package is available on CRAN and can be installed directly in R using install.packages(). You may want to run install_formats() after the first installation.

install.packages("rio")
install_formats()

The latest development version on GitHub can be installed using:

if (!require("remotes")){
    install.packages("remotes")
}
remotes::install_github("leeper/rio")

Usage

Because rio is meant to streamline data I/O, the package is extremely easy to use. Here are some examples of reading, writing, and converting data files.

Export

Exporting data is handled with one function, export():

library("rio")

export(mtcars, "mtcars.csv") # comma-separated values
export(mtcars, "mtcars.rds") # R serialized
export(mtcars, "mtcars.sav") # SPSS

A particularly useful feature of rio is the ability to import from and export to compressed (e.g., zip) directories, saving users the extra step of compressing a large exported file, e.g.:

export(mtcars, "mtcars.tsv.zip")

As of rio v0.5.0, export() can also write multiple data frames to respective sheets of an Excel workbook or an HTML file:

export(list(mtcars = mtcars, iris = iris), file = "mtcars.xlsx")

Import

Importing data is handled with one function, import():

x <- import("mtcars.csv")
y <- import("mtcars.rds")
z <- import("mtcars.sav")

# confirm data match
all.equal(x, y, check.attributes = FALSE)

## [1] TRUE

all.equal(x, z, check.attributes = FALSE)

## [1] TRUE

Note: Because of inconsistencies across underlying packages, the data.frame returned by import might vary slightly (in variable classes and attributes) depending on file type.

In rio v0.5.0, a new list-based import function was added. This allows users to import a list of data frames from a multi-object file (such as an Excel workbook, .Rdata file, zip directory, or HTML file):

str(m <- import_list("mtcars.xlsx"))

## List of 2
##  $ mtcars:'data.frame':  32 obs. of  11 variables:
##   ..$ mpg : num [1:32] 21 21 22.8 21.4 18.7 18.1 14.3 24.4 22.8 19.2 ...
##   ..$ cyl : num [1:32] 6 6 4 6 8 6 8 4 4 6 ...
##   ..$ disp: num [1:32] 160 160 108 258 360 ...
##   ..$ hp  : num [1:32] 110 110 93 110 175 105 245 62 95 123 ...
##   ..$ drat: num [1:32] 3.9 3.9 3.85 3.08 3.15 2.76 3.21 3.69 3.92 3.92 ...
##   ..$ wt  : num [1:32] 2.62 2.88 2.32 3.21 3.44 ...
##   ..$ qsec: num [1:32] 16.5 17 18.6 19.4 17 ...
##   ..$ vs  : num [1:32] 0 0 1 1 0 1 0 1 1 1 ...
##   ..$ am  : num [1:32] 1 1 1 0 0 0 0 0 0 0 ...
##   ..$ gear: num [1:32] 4 4 4 3 3 3 3 4 4 4 ...
##   ..$ carb: num [1:32] 4 4 1 1 2 1 4 2 2 4 ...
##  $ iris  :'data.frame':  150 obs. of  5 variables:
##   ..$ Sepal.Length: num [1:150] 5.1 4.9 4.7 4.6 5 5.4 4.6 5 4.4 4.9 ...
##   ..$ Sepal.Width : num [1:150] 3.5 3 3.2 3.1 3.6 3.9 3.4 3.4 2.9 3.1 ...
##   ..$ Petal.Length: num [1:150] 1.4 1.4 1.3 1.5 1.4 1.7 1.4 1.5 1.4 1.5 ...
##   ..$ Petal.Width : num [1:150] 0.2 0.2 0.2 0.2 0.2 0.4 0.3 0.2 0.2 0.1 ...
##   ..$ Species     : chr [1:150] "setosa" "setosa" "setosa" "setosa" ...

And for rio v0.6.0, a new list-based export function was added. This makes it easy to export a list of (possibly named) data frames to multiple files:

export_list(m, "%s.tsv")
c("mtcars.tsv", "iris.tsv") %in% dir()

## [1] TRUE TRUE

Convert

The convert() function links import() and export() by constructing a dataframe from the imported file and immediately writing it back to disk. convert() invisibly returns the file name of the exported file, so that it can be used to programmatically access the new file.

convert("mtcars.sav", "mtcars.dta")

It is also possible to use rio on the command-line by calling Rscript with the -e (expression) argument. For example, to convert a file from Stata (.dta) to comma-separated values (.csv), simply do the following:

Rscript -e "rio::convert('iris.dta', 'iris.csv')"

Supported file formats

rio supports a wide range of file formats. To keep the package slim, all non-essential formats are supported via “Suggests” packages, which are not installed (or loaded) by default. To ensure rio is fully functional, install these packages the first time you use rio via:

install_formats()

The full list of supported formats is below:

Format	Typical Extension	Import Package	Export Package	Installed by Default
Comma-separated data	.csv	data.table	data.table	Yes
Pipe-separated data	.psv	data.table	data.table	Yes
Tab-separated data	.tsv	data.table	data.table	Yes
CSVY (CSV + YAML metadata header)	.csvy	data.table	data.table	Yes
SAS	.sas7bdat	haven	haven	Yes
SPSS	.sav	haven	haven	Yes
SPSS (compressed)	.zsav	haven	haven	Yes
Stata	.dta	haven	haven	Yes
SAS XPORT	.xpt	haven	haven	Yes
SPSS Portable	.por	haven		Yes
Excel	.xls	readxl		Yes
Excel	.xlsx	readxl	openxlsx	Yes
R syntax	.R	base	base	Yes
Saved R objects	.RData, .rda	base	base	Yes
Serialized R objects	.rds	base	base	Yes
Epiinfo	.rec	foreign		Yes
Minitab	.mtp	foreign		Yes
Systat	.syd	foreign		Yes
“XBASE” database files	.dbf	foreign	foreign	Yes
Weka Attribute-Relation File Format	.arff	foreign	foreign	Yes
Data Interchange Format	.dif	utils		Yes
Fortran data	no recognized extension	utils		Yes
Fixed-width format data	.fwf	utils	utils	Yes
gzip comma-separated data	.csv.gz	utils	utils	Yes
Apache Arrow (Parquet)	.parquet	arrow	arrow	No
EViews	.wf1	hexView		No
Feather R/Python interchange format	.feather	feather	feather	No
Fast Storage	.fst	fst	fst	No
JSON	.json	jsonlite	jsonlite	No
Matlab	.mat	rmatio	rmatio	No
OpenDocument Spreadsheet	.ods	readODS	readODS	No
HTML Tables	.html	xml2	xml2	No
Shallow XML documents	.xml	xml2	xml2	No
YAML	.yml	yaml	yaml	No
Clipboard	default is tsv	clipr	clipr	No
Google Sheets	as Comma-separated data
Graphpad Prism	.pzfx	pzfx	pzfx	No

Additionally, any format that is not supported by rio but that has a known R implementation will produce an informative error message pointing to a package and import or export function. Unrecognized formats will yield a simple “Unrecognized file format” error.

Package Philosophy

The core advantage of rio is that it makes assumptions that the user is probably willing to make. Eight of these are important:

rio uses the file extension of a file name to determine what kind of file it is. This is the same logic used by Windows OS, for example, in determining what application is associated with a given file type. By removing the need to manually match a file type (which a beginner may not recognize) to a particular import or export function, rio allows almost all common data formats to be read with the same function. And if a file extension is incorrect, users can force a particular import method by specifying the format argument. Other packages do this as well, but rio aims to be more complete and more consistent than each:

reader handles certain text formats and R binary files
io offers a set of custom formats
ImportExport focuses on select binary formats (Excel, SPSS, and Access files) and provides a Shiny interface.
SchemaOnRead iterates through a large number of possible import methods until one works successfully

rio uses data.table::fread() for text-delimited files to automatically determine the file format regardless of the extension. So, a CSV that is actually tab-separated will still be correctly imported. It’s also crazy fast.
rio, wherever possible, does not import character strings as factors.
rio supports web-based imports natively, including from SSL (HTTPS) URLs, from shortened URLs, from URLs that lack proper extensions, and from (public) Google Documents Spreadsheets.
rio imports from from single-file .zip and .tar archives automatically, without the need to explicitly decompress them. Export to compressed directories is also supported.
rio wraps a variety of faster, more stream-lined I/O packages than those provided by base R or the foreign package. It uses data.table for delimited formats, haven for SAS, Stata, and SPSS files, smarter and faster fixed-width file import and export routines, and readxl and openxlsx for reading and writing Excel workbooks.
rio stores metadata from rich file formats (SPSS, Stata, etc.) in variable-level attributes in a consistent form regardless of file type or underlying import function. These attributes are identified as:
- label: a description of variable
- labels: a vector mapping numeric values to character strings those values represent
- format: a character string describing the variable storage type in the original file
The gather_attrs() function makes it easy to move variable-level attributes to the data frame level (and spread_attrs() reverses that gathering process). These can be useful, especially, during file conversion to more easily modify attributes that are handled differently across file formats. As an example, the following idiom can be used to trim SPSS value labels to the 32-character maximum allowed by Stata:
```
dat <- gather_attrs(rio::import("data.sav"))
attr(dat, "labels") <- lapply(attributes(dat)$labels, function(x) {
    if (!is.null(x)) {
        names(x) <- substring(names(x), 1, 32)
    }
    x
})
export(spread_attrs(dat), "data.dta")
```
In addition, two functions (added in v0.5.5) provide easy ways to create character and factor variables from these “labels” attributes. characterize() converts a single variable or all variables in a data frame that have “labels” attributes into character vectors based on the mapping of values to value labels. factorize() does the same but returns factor variables. This can be especially helpful for converting these rich file formats into open formats (e.g., export(characterize(import("file.dta")), "file.csv").
rio imports and exports files based on an internal S3 class infrastructure. This means that other packages can contain extensions to rio by registering S3 methods. These methods should take the form .import.rio_X() and .export.rio_X(), where X is the file extension of a file type. An example is provided in the rio.db package.