The fold change filter can apply symmetrically (both up and down) or only
in one direction, depending on the cardinality operator and the sign of
the limit. This picks the matching subset of rows from the lines
data frame built in buildVolcanoLines, where rows 1-2 are
the fold-down threshold, rows 3-4 the fold-up threshold, and rows 5-6 the
q-value threshold.
Usage
selectVolcanoLines(lines, fccard, fclim)
Arguments
- lines
data.frame of threshold lines with six rows, in the row
order described above
- fccard
Fold change cardinality operator, as returned by
getFoldChangeCard() from the contrasts module
- fclim
Fold change limit, as returned by getFoldChange()
from the contrasts module
Value
A subset of lines, with unused factor levels dropped
