### Name: generateExprVal
### Title: Compute a summary expression value from the probes intensities
### Aliases: generateExprVal generateExprVal-methods
###   generateExprVal.methods express.summary.stat
###   express.summary.stat-methods express.summary.stat.methods


### ** Examples

data(affybatch.example)

p <- probeset(affybatch.example, "A28102_at")[[1]]

par(mfcol=c(5,2))
mymethods <- express.summary.stat.methods
nmet <- length(mymethods)
nc <- ncol(pm(p))

layout(matrix(c(1:nc, rep(nc+1, nc)), nc, 2), width = c(1, 1))

barplot(p)

results <- matrix(0, nc, nmet)
rownames(results) <- paste("sample", 1:nc)
colnames(results) <- mymethods

for (i in 1:nmet) {
  ev <- express.summary.stat(p, summary=mymethods[i], pmcorrect="pmonly")
  if (mymethods[[i]] != "medianpolish")
    results[, i] <- 2^(ev$exprs)
  else
    results[, i] <- ev$exprs
}

dotchart(results, labels=paste("sample", 1:nc))