additional arguments to the relevant plot.ptable or plot.dwt.
VALUE:
same as that of plot.ptable or plot.dwt.
SIDE EFFECTS:
when x inherits from class dwt.molecule, a DWT plot is produced;
otherwise a packet table plot is produced.
DETAILS:
Coefficients in the molecule object are plotted at their locations in
a dwt object (when x inherits from class dwt.molecule) or a ptable
object (wavelet packet table or cosine packet table).