Extension of `data.frame`

Documentation for package ‘data.table’ version 1.15.2

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A B C D E F G H I J K L M N O P Q R S T U W Y misc

Enhanced data.frame

-- A --

address	Address in RAM of a variable
all.equal	Equality Test Between Two Data Tables
all.equal.data.table	Equality Test Between Two Data Tables
alloc.col	Over-allocation access
anyDuplicated	Determine Duplicate Rows
anyDuplicated.data.table	Determine Duplicate Rows
as.character.ITime	Integer based date class
as.data.table	Coerce to data.table
as.data.table.array	Coerce to data.table
as.data.table.character	Coerce to data.table
as.data.table.data.frame	Coerce to data.table
as.data.table.data.table	Coerce to data.table
as.data.table.Date	Coerce to data.table
as.data.table.factor	Coerce to data.table
as.data.table.integer	Coerce to data.table
as.data.table.list	Coerce to data.table
as.data.table.logical	Coerce to data.table
as.data.table.matrix	Coerce to data.table
as.data.table.numeric	Coerce to data.table
as.data.table.ordered	Coerce to data.table
as.data.table.xts	Efficient xts to as.data.table conversion
as.Date.IDate	Integer based date class
as.IDate	Integer based date class
as.IDate.Date	Integer based date class
as.IDate.default	Integer based date class
as.ITime	Integer based date class
as.ITime.character	Integer based date class
as.ITime.default	Integer based date class
as.ITime.POSIXlt	Integer based date class
as.ITime.times	Integer based date class
as.list.IDate	Integer based date class
as.matrix	Convert a data.table to a matrix
as.matrix.data.table	Convert a data.table to a matrix
as.POSIXct.IDate	Integer based date class
as.POSIXct.ITime	Integer based date class
as.POSIXlt.ITime	Integer based date class
as.xts.data.table	Efficient data.table to xts conversion
auto-index	Optimisations in data.table
auto-indexing	Optimisations in data.table
autoindex	Optimisations in data.table
autoindexing	Optimisations in data.table

-- B --

between

Convenience functions for range subsets.

-- C --

c.IDate	Integer based date class
c.ITime	Integer based date class
cdatatable	data.table exported C routines
chgroup	Faster match of character vectors
chmatch	Faster match of character vectors
chorder	Faster match of character vectors
CJ	Creates a join 'data.table'
class:data.table	S4 Definition for data.table
copy	Copy an entire object
cube	Grouping Set aggregation for data tables
cube.data.table	Grouping Set aggregation for data tables

-- D --

data.table	Enhanced data.frame
data.table-class	S4 Definition for data.table
data.table-optimize	Optimisations in data.table
data.table.optimize	Optimisations in data.table
datatable-optimize	Optimisations in data.table
datatable-symbols	Special symbols
datatable.optimize	Optimisations in data.table
dcast	Fast dcast for data.table
dcast.data.table	Fast dcast for data.table
droplevels	Fast droplevels
droplevels.data.table	Fast droplevels
duplicated	Determine Duplicate Rows
duplicated.data.table	Determine Duplicate Rows

-- E --

except

Set operations for data tables

-- F --

fastorder	Fast row reordering of a data.table by reference
fcase	fcase
fcoalesce	Coalescing missing values
fdroplevels	Fast droplevels
fexcept	Set operations for data tables
fifelse	Fast ifelse
fill	Fill missing values
fintersect	Set operations for data tables
first	First/last item of an object
forder	Fast row reordering of a data.table by reference
forderv	Fast row reordering of a data.table by reference
format.ITime	Integer based date class
format_col	data.table Printing Options
format_col.default	data.table Printing Options
format_col.expression	data.table Printing Options
format_col.POSIXct	data.table Printing Options
format_list_item	data.table Printing Options
format_list_item.default	data.table Printing Options
foverlaps	Fast overlap joins
frank	Fast rank
frankv	Fast rank
fread	Fast and friendly file finagler
froll	Rolling functions
frollapply	Rolling functions
frollmean	Rolling functions
frollsum	Rolling functions
fsetdiff	Set operations for data tables
fsetequal	Set operations for data tables
fsort	Fast parallel sort
funion	Set operations for data tables
fwrite	Fast CSV writer

-- G --

getDTthreads	Set or get number of threads that data.table should use
getNumericRounding	Change or turn off numeric rounding
GForce	Optimisations in data.table
gforce	Optimisations in data.table
groupingsets	Grouping Set aggregation for data tables
groupingsets.data.table	Grouping Set aggregation for data tables

-- H --

haskey	Create key on a data.table
hour	Integer based date class

-- I --

I	Substitute expression
IDate	Integer based date class
IDate-class	Integer based date class
IDateTime	Integer based date class
IDateTime.default	Integer based date class
ifelse	Fast ifelse
indices	Create key on a data.table
inrange	Convenience functions for range subsets.
intersect	Set operations for data tables
is.data.table	Coerce to data.table
is.na.data.table	Enhanced data.frame
isoweek	Integer based date class
ITime	Integer based date class
ITime-class	Integer based date class

-- J --

J	Creates a join 'data.table'

-- K --

key	Create key on a data.table

-- L --

lag	Fast lead/lag for vectors and lists
last	First/last item of an object
Last.updated	Number of rows affected by last update
lead	Fast lead/lag for vectors and lists
let	Assignment by reference
like	Convenience function for calling grep.
locf	Fill missing values

-- M --

mday	Integer based date class
mean.IDate	Integer based date class
mean.ITime	Integer based date class
measure	Specify measure.vars via regex or separator
measurev	Specify measure.vars via regex or separator
melt	Fast melt for data.table
melt.data.table	Fast melt for data.table
merge	Merge two data.tables
merge.data.table	Merge two data.tables
minute	Integer based date class
month	Integer based date class
moving	Rolling functions

-- N --

na.fill	Fill missing values
na.omit	Remove rows with missing values on columns specified
na.omit.data.table	Remove rows with missing values on columns specified
nafill	Fill missing values
nocb	Fill missing values

-- O --

openMP	Set or get number of threads that data.table should use
openmp	Set or get number of threads that data.table should use
Ops.data.table	Enhanced data.frame
order	Fast row reordering of a data.table by reference

-- P --

patterns	Obtain matching indices corresponding to patterns
print.data.table	data.table Printing Options
print.ITime	Integer based date class

-- Q --

quarter

Integer based date class

-- R --

rank	Fast rank
rbind	Makes one data.table from a list of many
rbind.data.table	Makes one data.table from a list of many
rbindlist	Makes one data.table from a list of many
rep.IDate	Integer based date class
rep.ITime	Integer based date class
rleid	Generate run-length type group id
rleidv	Generate run-length type group id
roll	Rolling functions
rollapply	Rolling functions
rolling	Rolling functions
rollmean	Rolling functions
rollsum	Rolling functions
rollup	Grouping Set aggregation for data tables
rollup.data.table	Grouping Set aggregation for data tables
round.IDate	Integer based date class
round.ITime	Integer based date class
rounding	Optimisations in data.table
rowid	Generate unique row ids within each group
rowidv	Generate unique row ids within each group

-- S --

second	Integer based date class
seq.IDate	Integer based date class
seq.ITime	Integer based date class
set	Assignment by reference
setalloccol	Over-allocation access
setattr	Set attributes of objects by reference
setcoalesce	Coalescing missing values
setcolorder	Fast column reordering of a data.table by reference
setDF	Coerce a data.table to data.frame by reference
setdiff	Set operations for data tables
setDT	Coerce lists and data.frames to data.table by reference
setDTthreads	Set or get number of threads that data.table should use
setequal	Set operations for data tables
setindex	Create key on a data.table
setindexv	Create key on a data.table
setkey	Create key on a data.table
setkeyv	Create key on a data.table
setnafill	Fill missing values
setnames	Set attributes of objects by reference
setNumericRounding	Change or turn off numeric rounding
setops	Set operations for data tables
setorder	Fast row reordering of a data.table by reference
setorderv	Fast row reordering of a data.table by reference
shift	Fast lead/lag for vectors and lists
shouldPrint	For use by packages that mimic/divert auto printing e.g. IRkernel and knitr
SJ	Creates a join 'data.table'
sliding	Rolling functions
special-symbols	Special symbols
split	Split data.table into chunks in a list
split.data.table	Split data.table into chunks in a list
strsplit	strsplit and transpose the resulting list efficiently
subset	Subsetting data.tables
subset.data.table	Subsetting data.tables
substitute	Substitute expression
substitute2	Substitute expression

-- T --

tables	Display 'data.table' metadata
test	Test assertions for equality, exceptions and console output
test.data.table	Runs a set of tests.
timetaken	Pretty print of time taken
transpose	Efficient transpose of list
truelength	Over-allocation access
trunc.ITime	Integer based date class
tstrsplit	strsplit and transpose the resulting list efficiently

-- U --

union	Set operations for data tables
unique	Determine Duplicate Rows
unique.data.table	Determine Duplicate Rows
uniqueN	Determine Duplicate Rows
update_dev_pkg	Perform update of development version of a package

-- W --

wday	Integer based date class
week	Integer based date class

-- Y --

yday	Integer based date class
year	Integer based date class
yearmon	Integer based date class
yearqtr	Integer based date class

-- misc --

%between%	Convenience functions for range subsets.
%chin%	Faster match of character vectors
%flike%	Convenience function for calling grep.
%ilike%	Convenience function for calling grep.
%inrange%	Convenience functions for range subsets.
%like%	Convenience function for calling grep.
%notin%	Convenience operator for checking if an example is not in a set of elements
%plike%	Convenience function for calling grep.
.	Enhanced data.frame
.(	Enhanced data.frame
.()	Enhanced data.frame
..	Enhanced data.frame
.BY	Special symbols
.EACHI	Special symbols
.GRP	Special symbols
.I	Special symbols
.Last.updated	Number of rows affected by last update
.N	Special symbols
.NGRP	Special symbols
.SD	Special symbols
:=	Assignment by reference
[.data.table	Enhanced data.frame