data.table v1.9.8


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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 xts to conversion Efficient data.table to xts conversion Coerce to data.table
data.table-class S4 Definition for data.table
address Address in RAM of a variable
:= Assignment by reference
all.equal Equality Test Between Two Data Tables
chmatch Faster match of character vectors
copy Copy an entire object
between Convenience functions for range subsets.
datatable.optimize Optimisations in data.table Fast dcast for data.table
duplicated Determine Duplicate Rows
first First item of an object
fwrite Fast CSV writer
fread Fast and friendly file finagler
fsort Fast parallel sort
frank Fast rank
data.table-package Enhanced data.frame
foverlaps Fast overlap joins
last Last item of an object
like Convenience function for calling regexpr. Remove rows with missing values on columns specified data.table Printing Options
patterns Obtain matching indices corresponding to patterns
setDTthreads Set or get number of threads that data.table should use
IDateTime Integer based date class Fast melt for data.table
J Creates a Join data table
merge Merge two data.tables
setDT Coerce lists and data.frames to data.table by reference
rowid Generate unique row ids within each group
setDF Coerce a data.table to data.frame by reference
setattr Set attributes of objects by reference
rbindlist Makes one data.table from a list of many
setops Set operations for data tables
setNumericRounding Change or turn off numeric rounding
setkey Create key on a data table
setcolorder Fast column reordering of a data.table by reference
rleid Generate run-length type group id
setorder Fast row reordering of a data.table by reference Runs a set of tests.
shouldPrint For use by packages that mimic/divert auto printing e.g. IRkernel and knitr
shift Fast lead/lag for vectors and lists
timetaken Pretty print of time taken
special-symbols Special symbols Subsetting data.tables
split Split data.table into chunks in a list Data table utilities
tables Display all objects of class 'data.table'
transpose Efficient transpose of list
truelength Over-allocation access
tstrsplit strsplit and transpose the resulting list efficiently
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License GPL-3 | file LICENSE
VignetteBuilder knitr
ByteCompile TRUE
NeedsCompilation yes
Packaged 2016-11-23 17:19:57.267 UTC; mdowle
Repository CRAN
Date/Publication 2016-11-25 12:55:43

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