mergeExp combines the output of calcExp from multiple
samples, i.e. multiple ExpressionSet objects, into a single ExpressionSet
mergeExp(..., sampleNames, keep=c('transcript','gene_id','island_id'))ExpressionSet objects to be combined.ExpressionSet to keep in the merged output.ExpressionSet combining the input
ExpressionSets. Its featureData contains the columns indicated
in the keep argument, plus a column readCount with the total
number of reads mapped to each gene (or gene island, when multiple
genes have overlapping exons).
mergeExp runs some checks to ensure that object can be combined
(e.g. making sure that measurements are obtained on same set of
genes), then sorts and formats each input
ExpressionSet.A label with the sample name is appended to variables in the featureData that appear in multiple samples, e.g. variable 'se' reporting standard errors (obtained by setting citype='asymp' in calcExp).
calcExp to obtain an ExpressionSet for an individual sample.