data.table v1.12.4


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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, friendly and fast character-separated-value read/write. Offers a natural and flexible syntax, for faster development.

Functions in data.table

Name Description
J Creates a join data.table
fifelse Fast ifelse Fast dcast for data.table
duplicated Determine Duplicate Rows
fcoalesce Coalescing missing values
foverlaps Fast overlap joins
data.table-class S4 Definition for data.table
copy Copy an entire object
chmatch Faster match of character vectors
data.table-package Enhanced data.frame
datatable.optimize Optimisations in data.table
like Convenience function for calling grep.
roll Rolling functions
merge Merge two data.tables
fsort Fast parallel sort Remove rows with missing values on columns specified
last First/last item of an object
.Last.updated Number of rows affected by last update
rowid Generate unique row ids within each group Fast melt for data.table
set2key Deprecated.
setcolorder Fast column reordering of a data.table by reference
setNumericRounding Change or turn off numeric rounding
shift Fast lead/lag for vectors and lists
shouldPrint For use by packages that mimic/divert auto printing e.g. IRkernel and knitr
fwrite Fast CSV writer
groupingsets Grouping Set aggregation for data tables
tstrsplit strsplit and transpose the resulting list efficiently
timetaken Pretty print of time taken Data table utilities
nafill Fill missing values Perform update of development version of a package
setattr Set attributes of objects by reference
setDTthreads Set or get number of threads that data.table should use
setkey Create key on a data.table
special-symbols Special symbols
setorder Fast row reordering of a data.table by reference Runs a set of tests.
test Test assertions for equality, exceptions and console output
setops Set operations for data tables
tables Display 'data.table' metadata Subsetting data.tables
patterns Obtain matching indices corresponding to patterns
frank Fast rank data.table Printing Options
split Split data.table into chunks in a list
rbindlist Makes one data.table from a list of many
setDT Coerce lists and data.frames to data.table by reference
rleid Generate run-length type group id
setDF Coerce a data.table to data.frame by reference
fread Fast and friendly file finagler
truelength Over-allocation access
transpose Efficient transpose of list
IDateTime Integer based date class
address Address in RAM of a variable
all.equal Equality Test Between Two Data Tables Coerce to data.table Efficient xts to conversion
between Convenience functions for range subsets.
:= Assignment by reference
as.matrix Convert a data.table to a matrix Efficient data.table to xts conversion
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