RData (.rdata, .rda)

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Import supports the RData format.

Background & Context

- R data format family.
- Stores a collection of typed objects.
- Supports ASCII, binary and XDR (big-endian binary) representations.
- Supports GZIP, BZIP2 and XZ compressions.
- Released in 1995 with an initial version of R.

Import

Import["file.RData"] imports an RData file as a list of data.
Imported RData is represented in the Wolfram Language by real or integer numbers, strings, Boolean values True and False, and DateObject specifications.
Import["file.RData",elements] imports the specified elements.
Import["file.RData",{elem,sub_a,sub_b,…}] imports a subelement.
The import format can be specified with Import["file","RData"] or Import["file",{"RData",elem,…}].
Import supports the following data types:

	"Boolean"	Booleans
	"Date"	dates as a list of DateObject objects
	"Integer32"	32-bit integers
	"Real64"	IEEE double‐precision numbers
	"String"	string of characters
	"Timestamp"	time instances

See the following reference pages for full general information:
Import import from a file

CloudImport import from a cloud object

ImportString import from a string

ImportByteArray import from a byte array

Import Elements

General Import elements:
"Elements" list of elements and options available in this file

"Summary" summary of the file

"Rules" list of rules for all available elements
Data representation elements:

	"Data"	two-dimensional array
	"Dataset"	table data as a Dataset
	"LabeledData"	association of labels and data
	"RawData"	raw data given as lists or NumericArray objects
	"Tabular"	list of Tabular objects
	"TabularAssociation"	association of labels and Tabular objects

Import by default uses the "Data" element.
Data descriptor elements:

	"DataFormat"	descriptions and types of columns
	"Labels"	names of columns
	"ObjectCount"	number of objects stored in file
	"ObjectNames"	names of the objects stored in file

Metadata elements:
"Dimensions" dimensions of the data

"Version" version of the RData specification for the file

Options

Import option:
"IndeterminateValues" Automatic replacement values for infinity, NaN, etc.
Use "IndeterminateValues" to provide replacement rules for different values. The following settings are supported:
val a fixed value val for any indeterminate value

<|"NaN"…,"Inf"…,"-Inf"…|> specific replacements depending on the type indeterminate

Examples

open allclose all

Basic Examples (2)Summary of the most common use cases

Import an RData file:

In[2]:=2

✖

https://wolfram.com/xid/0edrryfr2-f3zba1

Out[2]=2

Summary of an RData file:

In[1]:=1

✖

https://wolfram.com/xid/0edrryfr2-jorcfv

Out[1]=1

Import Elements (11)

Data Representation (5)

"Data" (1)

Import an RData file as lists of object values:

In[1]:=1

✖

https://wolfram.com/xid/0edrryfr2-nl71bm

Out[1]=1

This is also the default element:

In[2]:=2

✖

https://wolfram.com/xid/0edrryfr2-y6nmcj

Out[2]=2

"LabeledData" (1)

Import an RData file as rules of labels and data:

In[1]:=1

✖

https://wolfram.com/xid/0edrryfr2-qubbnp

Out[1]=1

"RawData" (1)

Import an RData file as data given as lists or NumericArray objects:

In[1]:=1

✖

https://wolfram.com/xid/0edrryfr2-l998qe

Out[1]=1

"Tabular" (1)

Import an RData file as lists of labels and Dataset objects:

In[1]:=1

✖

https://wolfram.com/xid/0edrryfr2-cx6rhv

Out[1]=1

"TabularAssociation" (1)

Import an RData file as an association of labels and Tabular objects:

In[1]:=1

✖

https://wolfram.com/xid/0edrryfr2-p3wd88

Out[1]=1

Data Descriptors (4)

"DataFormat" (1)

Import the data type of each object in an RData file:

In[1]:=1

✖

https://wolfram.com/xid/0edrryfr2-xf419t

Out[1]=1

"Labels" (1)

Import the names of each column in an RData file:

In[1]:=1

✖

https://wolfram.com/xid/0edrryfr2-bartxa

Out[1]=1

"ObjectCount" (1)

Import the number of objects in an RData file:

In[1]:=1

✖

https://wolfram.com/xid/0edrryfr2-7i03ic

Out[1]=1

"ObjectNames" (1)

Import the names of objects in an RData file:

In[1]:=1

✖

https://wolfram.com/xid/0edrryfr2-6c380x

Out[1]=1

Metadata (2)

"Dimensions" (1)

Import the dimensions of each column in an RData file:

In[1]:=1

✖

https://wolfram.com/xid/0edrryfr2-62lf19

Out[1]=1

"Version" (1)

Import the version of an RData file:

In[1]:=1

✖

https://wolfram.com/xid/0edrryfr2-8dqxq

Out[1]=1

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