data.table v1.10.4


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by Matt 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, a fast friendly file reader and parallel file writer. Offers a natural and flexible syntax, for faster development.


Project overview is on the GitHub Wiki tab, our HOMEPAGE

Functions in data.table

Name Description Efficient data.table to xts conversion
data.table-class S4 Definition for data.table
address Address in RAM of a variable Efficient xts to conversion Coerce to data.table
copy Copy an entire object
:= Assignment by reference
all.equal Equality Test Between Two Data Tables
chmatch Faster match of character vectors
between Convenience functions for range subsets.
first First item of an object
fsort Fast parallel sort
datatable.optimize Optimisations in data.table
duplicated Determine Duplicate Rows
frank Fast rank Fast dcast for data.table
foverlaps Fast overlap joins
fread Fast and friendly file finagler
data.table-package Enhanced data.frame
fwrite Fast CSV writer data.table Printing Options
like Convenience function for calling regexpr.
IDateTime Integer based date class
merge Merge two data.tables
J Creates a Join data table
patterns Obtain matching indices corresponding to patterns
last Last item of an object Remove rows with missing values on columns specified
setDTthreads Set or get number of threads that data.table should use Fast melt for data.table
rowid Generate unique row ids within each group
rbindlist Makes one data.table from a list of many
setNumericRounding Change or turn off numeric rounding
setattr Set attributes of objects by reference
setops Set operations for data tables
rleid Generate run-length type group id
setDT Coerce lists and data.frames to data.table by reference
setkey Create key on a data table
setcolorder Fast column reordering of a data.table by reference
setDF Coerce a data.table to data.frame by reference
setorder Fast row reordering of a data.table by reference
shouldPrint For use by packages that mimic/divert auto printing e.g. IRkernel and knitr
shift Fast lead/lag for vectors and lists
transpose Efficient transpose of list
special-symbols Special symbols
tables Display all objects of class 'data.table'
truelength Over-allocation access Runs a set of tests.
timetaken Pretty print of time taken
tstrsplit strsplit and transpose the resulting list efficiently
split Split data.table into chunks in a list Data table utilities Subsetting data.tables
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License GPL-3 | file LICENSE
VignetteBuilder knitr
ByteCompile TRUE
NeedsCompilation yes
Packaged 2017-02-01 00:15:31.074 UTC; mdowle
Repository CRAN
Date/Publication 2017-02-01 15:52:19

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