#' Convert data.frame into ExpressionSet Object.
#'
#' Convert data.frame into ExpressionSet Object.
#' @param dat a data.frame with gene in row, sample in column
#' @param state sample state. For multi instances.
#' @return an ExpressionSet object
#' @author Zhilong Jia
#' @import Biobase
#' @export
#' @examples
#' dat <- data.frame(d1=1:600, D1=600:1, d2=sample(600))
#' datExp <- makeExpressionSet(dat, state=c("d", "D", "d"))
#'
#' # Only for rankMerging
#' MergingSet <- RankMerging(datExp,"Spearman",weighted=TRUE)
#' #ds <- ScoreGSEA(datExp, 250)
#' #ds1 <- ScorePGSEA(datExp, 250)
#' #ds2 <- ScoreGSEA(MergingSet, 250)
#' #ds3 <- ScorePGSEA(MergingSet, 250)
#'
makeExpressionSet <- function(dat, state=colnames(dat)){
# delete the rownames of data or the PGSEA will go wrong.
row.names(dat)<-NULL
dat <- data.matrix(dat)
pdata <- as.data.frame(state)
rownames(pdata) <- colnames(dat)
metadata <- data.frame(labelDescription=c("state"), row.names=c("state"))
phenoData <- new("AnnotatedDataFrame", data=pdata, varMetadata=metadata)
dataExp <- ExpressionSet(assayData=dat, phenoData=phenoData)
dataExp
}
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