data.table v1.8.10


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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 by reference, 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
J Creates a Join data table
all.equal Equality Test Between Two Data Tables
IDateTime Integer based date class
chmatch Faster match of character vectors
last Last item of an object
merge Merge Two Data Tables
like Convenience function for calling regexpr.
data.table Enhanced data.frame
between Convenience function for range subset logic. Subsetting data.tables
:= Assignment by reference
fread Fast and friendly file finagler
address Address in RAM of a variable
setkey Create key on a data table
rbindlist Makes one data.table from a list of many
truelength Over-allocation access Data table utilities
data.table-class S4 Definition for data.table
duplicated Determine Duplicate Rows
timetaken Pretty print of time taken Runs a set of tests.
tables Display all objects of class 'data.table'
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License GPL (>= 2)
ByteCompile TRUE
Packaged 2013-09-02 23:44:04 UTC; mdowle
NeedsCompilation yes
Repository CRAN
Date/Publication 2013-09-03 06:40:57

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