data.table v1.9.4

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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
duplicated Determine Duplicate Rows
between Convenience function for range subset logic.
merge Merge Two Data Tables
IDateTime Integer based date class
J Creates a Join data table
tables Display all objects of class 'data.table'
copy Copy an entire object
setNumericRounding Change or turn off numeric rounding
timetaken Pretty print of time taken
address Address in RAM of a variable
rbindlist Makes one data.table from a list of many
transform.data.table Data table utilities
test.data.table Runs a set of tests.
data.table-package Enhanced data.frame
data.table-class S4 Definition for data.table
setDF Convert a data.table to data.frame by reference
all.equal Equality Test Between Two Data Tables
setorder Fast reordering of a data.table by reference
fread Fast and friendly file finagler
chmatch Faster match of character vectors
last Last item of an object
foverlaps Fast overlap joins
setkey Create key on a data table
setDT Convert lists and data.frames to data.table by reference
melt.data.table Fast melt for data.table
:= Assignment by reference
subset.data.table Subsetting data.tables
dcast.data.table Fast dcast for data.table
truelength Over-allocation access
setattr Set attributes to objects by reference
like Convenience function for calling regexpr.
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License GPL (>= 2)
URL https://github.com/Rdatatable/data.table/wiki
BugReports https://github.com/Rdatatable/data.table/issues
MailingList datatable-help@lists.r-forge.r-project.org
ByteCompile TRUE
Packaged 2014-10-02 01:58:23.662 UTC; mdowle
NeedsCompilation yes
Repository CRAN
Date/Publication 2014-10-02 08:40:58

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