data.table v1.9.2


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by M Dowle

Extension of data.frame

Fast aggregation of large data (e.g. 100GB in RAM), fast ordered joins, fast add/modify/delete of columns by group using no copies at all, list columns and a fast file reader (fread). Offers a natural and flexible syntax, for faster development.

Functions in data.table

Name Description
IDateTime Integer based date class Runs a set of tests.
chmatch Faster match of character vectors
J Creates a Join data table
tables Display all objects of class 'data.table' Subsetting data.tables
timetaken Pretty print of time taken
last Last item of an object
all.equal Equality Test Between Two Data Tables Fast dcast for data.table
merge Merge Two Data Tables Data table utilities
rbindlist Makes one data.table from a list of many
data.table-class S4 Definition for data.table
data.table-package Enhanced data.frame
fread Fast and friendly file finagler
address Address in RAM of a variable
between Convenience function for range subset logic.
:= Assignment by reference
like Convenience function for calling regexpr. Fast melt for data.table
duplicated Determine Duplicate Rows
truelength Over-allocation access
setkey Create key on a data table
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License GPL (>= 2)
ByteCompile TRUE
Packaged 2014-02-27 11:20:02 UTC; mdowle
NeedsCompilation yes
Repository CRAN
Date/Publication 2014-02-27 14:48:59

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