head: Return the First to Last Part of a Data Object

In limma: Linear Models for Microarray Data

Description

Retrieve the first or last parts of an RGList, MAList, EListRaw, EList, MArrayLM or TestResults object.

Usage

## S3 method for class 'EList'
head(x, n = 6L, ...)
## S3 method for class 'EList'
tail(x, n = 6L, ...)

Arguments

x	an object of class RGList, MAList, EListRaw, EList, MArrayLM or TestResults.
n	a single integer. If positive or zero, number rows of resulting object. If negative, all but the n last/first rows of x.
...	other arguments are not currently used.

Details

head (tail) returns the first (last) n rows when n >= 0 or all but the last (first) n rows when n < 0.

Value

An object like x but generally with fewer rows.

Author(s)

Gordon Smyth

See Also

head in the utils package.

02.Classes gives an overview of data classes used in LIMMA.

Examples

E <- matrix(rnorm(40),20,2)
rownames(E) <- paste0("Gene",1:20)
colnames(E) <- c("A","B")
y <- new("EList",list(E=E))
head(y)
tail(y)

limma documentation built on Nov. 8, 2020, 8:28 p.m.