data.table v1.8.4

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by M Dowle

Extension of data.frame for fast indexing, fast ordered joins, fast assignment, fast grouping and list columns.

Enhanced data.frame. Fast indexing, fast ordered joins, fast assignment, fast grouping and list columns in a short and flexible syntax. i and j may be expressions of column names directly, for faster development. Example: X[Y] is a fast join for large data.

Functions in data.table

Name Description
duplicated Determine Duplicate Rows
setkey Create key on a data table
data.table Enhanced data.frame
truelength Over-allocation access
all.equal Equality Test Between Two Data Tables
timetaken Pretty print of time taken
like Convenience function for calling regexpr.
IDateTime Integer based date class
between Convenience function for range subset logic.
data.table-class S4 Definition for data.table
:= Assignment by reference
J Creates a Join data table
chmatch Faster match of character vectors
merge Merge Two Data Tables
subset.data.table Subsetting data.tables
rbindlist Makes one data.table from a list of many
tables Display all objects of class 'data.table'
transform.data.table Data table utilities
last Last item of an object
test.data.table Runs a set of tests.
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License GPL (>= 2)
URL http://datatable.r-forge.r-project.org/
BugReports https://r-forge.r-project.org/tracker/?group_id=240
ByteCompile TRUE
Packaged 2012-11-09 14:39:44 UTC; mdowle
Repository CRAN
Date/Publication 2012-11-09 15:23:05

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