MAMA (version 1.0.2)

fold.change: function to do compute fold change between two groups

Description

Function computes fold change between two groups of log2-transformed data

Usage

fold.change(data, group)

Arguments

data

microarray dataset - ExpressionSet object

group

number of column of pData indicating group labels

Value

• vector of fold change

Examples

data(Singhdata)
exprs<-as.matrix(Singhdata$esets[[1]])
rownames(exprs)<-Singhdata$geneNames
metadata=data.frame(labelDescription=c("Normal/Tumour"), row.names=c("group"))
pData<-data.frame(group=Singhdata$classes[[1]]+1)
rownames(pData)<-colnames(exprs)
phenoData<-new("AnnotatedDataFrame", data=pData,varMetadata=metadata)
data<-new("ExpressionSet", exprs=exprs, phenoData=phenoData)
fc<-fold.change(data,1)