shallow: shallow copy a 'data.table'

In asrinivasan-oa/gread: Fast Reading and Processing of Common Gene Annotation and Next Generation Sequencing Format Files

Description

Convenience function to shallow copy a data.table (until this function is exported in the data.table package). For internal use only.

Usage

shallow(x, cols = names(x), reset_class = FALSE)

Arguments

x	A data.table.
cols	Character vector of column names (from x).
reset_class	logical (default FALSE). If TRUE, resets the class to "data.table", "data.frame".

Value

A shallow copied data.table.

Examples

## Not run: 
# For internal use only
library(data.table)
x <- data.table(a=1:2, b=3:4)
setattr(x, 'class', c("tmp", class(x)))

y <- gread:::shallow(x) # only copies column pointers
class(y) # class(x) is retained

## End(Not run)

asrinivasan-oa/gread documentation built on May 10, 2019, 2:04 p.m.