data.table v1.8.8


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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
IDateTime Integer based date class
all.equal Equality Test Between Two Data Tables
setkey Create key on a data table
chmatch Faster match of character vectors
:= Assignment by reference
merge Merge Two Data Tables
J Creates a Join data table
fread Fast and friendly file finagler
data.table-class S4 Definition for data.table Runs a set of tests.
timetaken Pretty print of time taken
between Convenience function for range subset logic.
like Convenience function for calling regexpr.
duplicated Determine Duplicate Rows Subsetting data.tables Data table utilities
rbindlist Makes one data.table from a list of many
truelength Over-allocation access
last Last item of an object
data.table Enhanced data.frame
tables Display all objects of class 'data.table'
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License GPL (>= 2)
ByteCompile TRUE
Packaged 2013-03-06 00:45:37 UTC; mdowle
NeedsCompilation yes
Repository CRAN
Date/Publication 2013-03-06 07:31:34

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