data.table v1.10.4-1


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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
address Address in RAM of a variable
all.equal Equality Test Between Two Data Tables Coerce to data.table Efficient xts to conversion Efficient data.table to xts conversion
:= Assignment by reference
between Convenience functions for range subsets.
chmatch Faster match of character vectors
IDateTime Integer based date class
J Creates a Join data table
copy Copy an entire object
data.table-class S4 Definition for data.table
first First item of an object
foverlaps Fast overlap joins
frank Fast rank
fread Fast and friendly file finagler Fast melt for data.table
merge Merge two data.tables Fast dcast for data.table
duplicated Determine Duplicate Rows
patterns Obtain matching indices corresponding to patterns
fsort Fast parallel sort
fwrite Fast CSV writer
setDT Coerce lists and data.frames to data.table by reference Remove rows with missing values on columns specified
setDTthreads Set or get number of threads that data.table should use
rowid Generate unique row ids within each group
setDF Coerce a data.table to data.frame by reference data.table Printing Options
setkey Create key on a data table
setops Set operations for data tables
split Split data.table into chunks in a list Subsetting data.tables
tstrsplit strsplit and transpose the resulting list efficiently
setNumericRounding Change or turn off numeric rounding
tables Display all objects of class 'data.table' Runs a set of tests.
setattr Set attributes of objects by reference
setcolorder Fast column reordering of a data.table by reference
timetaken Pretty print of time taken Data table utilities
shouldPrint For use by packages that mimic/divert auto printing e.g. IRkernel and knitr
special-symbols Special symbols
transpose Efficient transpose of list
truelength Over-allocation access
data.table-package Enhanced data.frame
datatable.optimize Optimisations in data.table
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
setorder Fast row reordering of a data.table by reference
shift Fast lead/lag for vectors and lists
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License GPL-3 | file LICENSE
VignetteBuilder knitr
ByteCompile TRUE
NeedsCompilation yes
Packaged 2017-10-09 18:09:29.904 UTC; mdowle
Repository CRAN
Date/Publication 2017-10-09 22:36:13 UTC

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