Low level routine to apply the DKM background correction step of RMA
numeric matrix of expression data, with a row for each gene/oligo, and a column for each sample
target value for the mode of the density kernel for each column
This function implements the background subtraction step of RMA. It
prevents the creation of negative expression values, by a linear
compaction of values smaller than
a numeric matrix of the same size as
m, with the background
correction linear shift applied to all columns
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