data.table v1.8.6

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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
data.table-class S4 Definition for data.table
last Last item of an object
between Convenience function for range subset logic.
like Convenience function for calling regexpr.
chmatch Faster match of character vectors
all.equal Equality Test Between Two Data Tables
truelength Over-allocation access
IDateTime Integer based date class
rbindlist Makes one data.table from a list of many
duplicated Determine Duplicate Rows
merge Merge Two Data Tables
subset.data.table Subsetting data.tables
setkey Create key on a data table
:= Assignment by reference
tables Display all objects of class 'data.table'
transform.data.table Data table utilities
timetaken Pretty print of time taken
data.table Enhanced data.frame
J Creates a Join data table
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 2012-11-13 01:08:06 UTC; mdowle
Repository CRAN
Date/Publication 2012-11-13 13:28:37

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