strictly_nonunique: Return only those rows where rows per group is > 1.

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

Description

For internal use only. It returns only rows corresponding to those groups where the number of rows > 1L. This is equivalent to doing DT[, if (.N>1L) .SD, by=c(...)].

Usage

strictly_nonunique(x, cols = names(x))

Arguments

x	A data.table.
cols	Character vector of column names (from x).

Value

A data.table.

Examples

## Not run: 
require(data.table)
dt <- data.table(x=c(1,1,1,2,2), y=c(3,3,4,5,6))
strictly_nonunique(dt) # Only 1,3 occurs more than once
strictly_nonunique(dt, "x") # all values occur more than once

## End(Not run)

openanalytics/gread documentation built on May 24, 2019, 2:29 p.m.