data.table v1.10.4-3


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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 Fast melt for data.table
fsort Fast parallel sort
patterns Obtain matching indices corresponding to patterns data.table Printing Options
setDF Coerce a data.table to data.frame by reference Runs a set of tests.
transpose Efficient transpose of list
rowid Generate unique row ids within each group
tables Display all objects of class 'data.table'
truelength Over-allocation access
setattr Set attributes of objects by reference
shift Fast lead/lag for vectors and lists
setorder Fast row reordering of a data.table by reference
setcolorder Fast column reordering of a data.table by reference
datatable.optimize Optimisations in data.table
split Split data.table into chunks in a list
merge Merge two data.tables
fwrite Fast CSV writer
setkey Create key on a data table
setops Set operations for data tables Remove rows with missing values on columns specified Subsetting data.tables
setDTthreads Set or get number of threads that data.table should use
last Last item of an object
like Convenience function for calling regexpr.
rbindlist Makes one data.table from a list of many
rleid Generate run-length type group id Data table utilities
timetaken Pretty print of time taken
setDT Coerce lists and data.frames to data.table by reference
shouldPrint For use by packages that mimic/divert auto printing e.g. IRkernel and knitr
setNumericRounding Change or turn off numeric rounding
tstrsplit strsplit and transpose the resulting list efficiently
special-symbols Special symbols Efficient xts to conversion Efficient data.table to xts conversion
all.equal Equality Test Between Two Data Tables
address Address in RAM of a variable
chmatch Faster match of character vectors Coerce to data.table
between Convenience functions for range subsets.
J Creates a Join data table
IDateTime Integer based date class
:= Assignment by reference
copy Copy an entire object
frank Fast rank
data.table-class S4 Definition for data.table
first First item of an object Fast dcast for data.table
foverlaps Fast overlap joins
duplicated Determine Duplicate Rows
data.table-package Enhanced data.frame
fread Fast and friendly file finagler
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License GPL-3 | file LICENSE
VignetteBuilder knitr
ByteCompile TRUE
NeedsCompilation yes
Packaged 2017-10-19 21:11:19.239 UTC; mdowle
Repository CRAN
Date/Publication 2017-10-27 07:40:34 UTC

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