makeContrasts {limma}R Documentation

Construct Matrix of Custom Contrasts

Description

Construct the contrasts matrix corresponding to specified contrasts of a set of given parameters.

Usage

makeContrasts(..., levels) 

Arguments

... expressions, or character strings which can be parsed to expressions, specifying contrasts
levels character vector giving the names of the parameters to be contrasts, or a factor or design matrix from which the names can be extracted.

Value

Matrix which columns corresponding to contrasts.

Author(s)

Gordon Smyth

See Also

An overview of linear model functions in limma is given by 06.LinearModels.

Examples

makeContrasts(B-A,C-B,C-A,levels=c("A","B","C"))
makeContrasts("A","B","B-A",levels=c("A","B"))

[Package limma version 2.4.7 Index]